TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal or metals in the metal silicate mass reside within the group IA, IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VB, VIB, VIIB, or VIIIB elements of the periodic table. The metal silicate mass is composed of at least one naturally occurring metal silicate mineral e.g. wollastonite, enstatite, olivine, serptine, pyroxene, diopside, feldspar, mica, or talc, or is composed of or derived from rocks or geologic strata containing at least one of the metal silicate minerals. The metal silicate is insoluble or sparingly soluble in the water solution prior to introduction of the direct current electricity to the hydroxyl-producing cathode and the acid-producing anode. The metal silicate mass is ground, powdered, fractured, drilled or in other ways made porous in order to increase the surface area and porosity of the metal silicate mass in contact with the water solution. The metal silicate mass is held in close proximity to the hydroxyl-producing cathode, and/or the acid-producing anode by the use of at least one porous vessel such as cups, tubes, boxes, or other containers, where the vessel or vessels are at least partly porous to the water solution so as to allow contact of the water solution with the metal silicate mass contained within the vessel or vessels once the vessel or vessels are at least partially submerged in the water solution. The ion concentration is provided by the presence in the water solution of at least one dissolve metal salt e.g. chlorides, sulfates, or nitrates of sodium, calcium, magnesium, or potassium. The hydroxyl is produced by the electrochemical splitting of the water, or is produced by the electrochemical reduction of oxygen. The metal hydroxide is processed by chemical, electrochemical, thermal, gravimetric, or other ways to concentrate, chemically reduce, refine, or smelt some or all of the metal contained in the metal hydroxide. The water solution is derived from the ocean, from naturally saline surface water or ground water, from saline waste water, or any other water solution whose ion concentration, such as that provided by dissolve metal salts, is naturally sufficient to allow the direct current electricity to pass in the direct current electricity path in sufficient quantity and voltage to produce acid at the acid-producing anode and produce hydroxyl at the hydroxyl-producing cathode. The direct current electricity path is achieved or maintained by the addition of ions to the water solution or by enriching ions in the water solution via water evaporation, electrodialysis, pressure dialysis, or by other methods, dissolved metal salts being one source for the ions. The water solution is a water solution as contained or produced in the ocean or in a natural or artificial water body or underground water body or aquifer. The direct current electricity source is derived from coal, natural gas, oil, wind, solar, hydro, wave, tidal, ocean thermal, geothermal, geochemical, biochemical, biomass, nuclear or other energy source. At least one acid gas from a gas stream, mixture, or parcel, e.g. a waste gas stream or the atmosphere is contacted by, reacted with, and consumed by the metal hydroxide to form metal salts of those gases, where the contacting is facilitated by a natural, artificial, or manufactured contactor of gas and metal hydroxide, where the natural contactor is a natural water body into which the metal hydroxide is added and whose surface contacts the gas mixture. The acid gases are carbon dioxide, sulfur dioxide, nitrous oxide, or hydrogen sulfide, where the metal salts formed are metal bicarbonates, carbonates, nitrites, nitrates, sulfites, or sulfates. The metal salt is processed by chemical, electrochemical, thermal, gravimetric, or other means to concentrate, chemically reduce, refine, or smelt metal from the metal salts. The silicic acid, the silica, or the other silicon compounds are used for industrial, chemical, manufacturing, agricultural, aquacultural, environmental, or other purposes, or are stored or discarded. The metal silicate is a metal silicate mineral that is naturally or artificially amassed above or below the earth's surface, or in the ocean or other water body. The direct current electricity applied across the acid-producing anode and hydroxyl-producing cathode is of sufficient current and voltage to generate a reducing gas or gases from the water solution at the cathode, or to generate an oxidizing gas or gases from the water solution at the anode, or to generate both reducing and oxidizing gases at the hydroxyl-producing cathode and the acid-producing anode, respectively, where the reducing gas is hydrogen, or other gases and the oxidizing gas is oxygen, chlorine, or other gases. The acid gases are carbon dioxide, sulfur dioxide, nitrous oxide, or hydrogen sulfide, where the metal salts formed are metal bicarbonates, carbonates, nitrites, nitrates, sulfites, or sulfates. The metal silicate mass in method (M3) is composed of metal silicate mineral that is naturally or artificially amassed above or below the earth's surface, or in the ocean or other water body, e.g. the metal silicate mineral being wollastonite, enstatite, olivine, serpentine, pyroxene, diopside, feldspar, mica, or talc, or being as contained in rock or a geologic stratum bearing at least one such metal silicate mineral. Preferred Method: The method (M1) of forming metal hydroxide, involves providing a hydroxyl-producing cathode (i.e. an OH--producing cathode); providing an acid-producing producing anode (i.e. a H+ or H3O+-producing anode); connecting a direct current electricity source to the hydroxyl-producing cathode and the acid-producing anode with the direct current electricity being capable of producing a direct current electricity path between the hydroxyl-producing cathode and the acid-producing anode, where the direct current electricity is of sufficient current and voltage to produce acid at the acid-producing anode, and/or hydroxyl at the hydroxyl-producing cathode; providing a metal silicate mass that is contacted by the acid and/or by the hydroxyl; providing a water solution into which the acid-producing anode and the hydroxyl-producing cathode are at least partially submerged, where the water solution has an ion concentration sufficient to allow the direct current electricity to pass in the direct current electricity path between the acid-producing anode and the hydroxyl-producing cathode, where the acid and/or the hydroxyl are of sufficient concentration to dissolve at least some of the metal silicate into metal ions and silicate ions, where the silicate ions react with the acid produced at the acid-producing anode and form at least one of the following: silica, silicic acid, other silicon compounds, and where the metal ions react with the acid formed at the acid-forming anode to produce a metal salt, allowing excess metal hydroxide produced from the water solution at the cathode to accumulate in the water solution, or the metal ions react with the hydroxyl produced at the hydroxyl-producing cathode and form metal hydroxide. The method (M2) of removing acid gas from a gas stream, mixture, or parcel, involves providing a hydroxyl-producing cathode (i.e. an OH--producing cathode); providing an acid-producing producing anode (i.e. a H+ or H3O+-producing anode); connecting a direct current electricity source to the hydroxyl-producing cathode and the acid-producing anode with the direct current electricity being capable of producing a direct current electricity path between the hydroxyl-producing cathode and the acid-producing anode; providing a metal silicate mass that is contacted by the acid and/or by the hydroxyl ions; providing a water solution into which the acid-producing anode and the hydroxyl-producing cathode are at least partially submerged, where the water solution has a sufficient ion concentration to allow the direct current electricity to pass in the direct current electricity path between the acid-producing anode and the hydroxyl-producing cathode; providing sufficient current and voltage in the direct current electricity path to generate hydroxyl ions at the hydroxyl-producing cathode and/or acid at the acid-producing anode, where the acid and/or the hydroxyl are of sufficient concentration to dissolve at least some of the metal silicate into metal ions and silicate ions, where the silicate ions travel toward the acid-producing anode and form at least one of the following: silica, or silicic acid, or other silicon compounds, where the metal ions react with the acid formed at the acid-producing anode to produce a metal salt, allowing excess metal hydroxide produced from ions within the water solution at the hydroxyl-producing cathode to accumulate in the water solution, or the metal ions react with the hydroxyl produced at the hydroxyl-producing cathode and form metal hydroxide, and where the acid gas is contacted by, reacted with, and consumed by the metal hydroxide to form metal salts of those gases, where the contacting is facilitated by a natural, artificial, or manufactured contactor (205) of gas and metal hydroxide, where the natural contactor is a natural water body into which the metal hydroxide is added and whose surface contacts the gas mixture. The method (M4) of producing hydrogen (209), oxygen, chlorine or other gases, involves providing a hydroxyl-producing cathode (i.e. an OH--producing cathode); providing an acid-producing producing anode (i.e. a H+ or H3O+-producing anode); connecting a direct current electricity source to the hydroxyl-producing cathode and the acid-producing anode, with the direct current electricity being capable of producing a direct current electricity path between the hydroxyl-producing cathode and the acid-producing anode, thereby producing acid at the acid-producing anode, and/or hydroxyl at the hydroxyl-producing cathode; providing a metal silicate mass that is contacted by the acid and/or by the hydroxyl; providing a water solution into which the acid-producing anode and the hydroxyl-producing cathode are at least partially submerged, where the water solution has a sufficient ion concentration to allow the direct current electricity to pass in the direct current electricity path between the acid-producing anode and the hydroxyl-producing cathode; providing sufficient current and voltage in the direct current electricity path to generate hydroxyl at the hydroxyl-producing cathode and generate acid at the acid-producing anode, where the acid and/or the hydroxyl ions are of sufficient concentration to dissolve at least some of the metal silicate into metal ions and silicate ions, where the silicate ions react with the acid produced at the acid-producing anode and form at least one of the following: silica, silicic acid, other silicon compounds, where the metal ions react with the acid formed at the acid-forming anode to produce a metal salt, allowing excess metal hydroxide produced from the water solution at the cathode to accumulate in the water solution, or the metal ions react with the hydroxyl produced at the hydroxyl-producing cathode and form metal hydroxide, where the current and the voltage are sufficient to generate oxidative gases (210) at the acid-producing anode, and/or reducing gases at the hydroxyl-producing cathode, where the oxidative gases are oxygen, chlorine, or other gases, and the reducing gases is hydrogen or other gases, where the gases are derived from the electrolysis of water in the water solution or from the ions contained in the water solution e.g. those ions provided by a dissolved metals salt contained in the water solution. The step of providing a metal silicate mass involves providing a metal silicate mass whose metal or metals are members of the group IA, IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VB, VIB, VIIB, or VIIIB elements of the periodic table. The step of providing a metal silicate mass involves providing a metal silicate mass that is composed of at least one naturally occurring metal silicate mineral e.g. wollastonite, enstatite, olivine, serptine, pyroxene, diopside, feldspar, mica, or talc, or is composed of rock or rocks containing at least one of the metal silicate minerals. The step of providing a metal silicate mass involves providing a metal silicate mass, where the metal silicate is insoluble or sparingly soluble in the water solution prior to introduction of the step of connecting a direct current electricity source to the hydroxyl-producing cathode and the acid-producing anode. The metal silicate mass is ground, powdered, fractured, drilled or in other ways made porous in order to increase the surface area and porosity of the metal silicate mass in contact with the water solution. The metal silicate mass is held in close proximity to the hydroxyl-producing cathode, and/or the acid-producing anode by the use of at least one porous vessel such as cups, tubes, boxes, or other containers, where the vessel or vessels are at least partly porous to the water solution so as to allow contact of the water solution with the metal silicate mass as contained within the vessel or vessels once the vessel or vessels are at least partially submerged in the water solution. The ion concentration is provided by the presence in the water solution of at least one dissolve metal salt e.g. chlorides, sulfates, or nitrates of sodium, calcium, magnesium, or potassium. The hydroxyl is produced by the electrochemical splitting of the water, or where the hydroxyl is produced by the electrochemical reduction of oxygen. The step of providing a water solution involves providing a water solution derived from the ocean, from naturally saline surface water or ground water, from saline waste water, or any other water solution whose ion concentration is naturally sufficient to allow the electric current to pass in the current path with sufficient current and voltage to produce acid at the acid-producing anode and/or produce hydroxyl at the hydroxyl-producing cathode. The step of maintaining the sufficient voltage and the direct current electricity path is achieved or maintained by the addition of ions to the water solution or by enriching ions in the water solution via water evaporation, electrodialysis, pressure dialysis, or by other methods, dissolved metal salt being one source of such ions. The step of providing a water solution involves providing a water solution as contained in or produced in the ocean or in a natural or artificial water body, or underground water body or aquifer. The step of connecting a direct current electricity source to the hydroxyl-producing cathode and the acid-producing anode involves connecting a direct current electricity source that is derived from coal, natural gas, oil, or other fossil energy, or from wind, solar, hydro, wave, tidal, ocean thermal, geothermal, geochemical, biochemical, biomass, or nuclear energy to the hydroxyl-producing cathode and the acid-producing anode. The method (M1) includes the step of using the silica, the silicic acid, or the other silicon compounds for chemical, industrial, manufacturing, agricultural, aquacultural, environmental, or other purposes, or the silica, the silicic acid, or the other silicon compounds are stored or discarded. In method (M2), the gas stream, mixture, or parcel is as contained in or derived from a waste gas stream or the earth's atmosphere. The method (M2) includes the step of using some or all of the metal salt for chemical, industrial, manufacturing, agricultural, aquacultural, or environmental purposes, or the metal salt is stored or discarded. The method (M2) includes the step of further processing the metal salt by chemical, electrochemical, thermal, gravimetric, or other means to concentrate, chemically reduce, refine, or smelt the metals. In method (M3), the acid-producing anode, and/or hydroxyl-producing cathode together with the water solution are placed within and operated within the metal silicate mass to effect removal, excavation, penetration, or reduction in mass of the metal silicate or to effect the removal, excavation, penetration, or reduction in mass of the metal silicate, and to also effect at least one of the following: 1) the production of metal hydroxide, 2) the removal of CO2 or other acid gas or gases from a gas mixture, stream, or parcel using the metal hydroxide as a reactant to form metal salts from the acid gas or gases, 3) the extraction and refining of metals from the metal hydroxide and/or the metal salts, 4) the production of reducing gases such as hydrogen, 5) the production of oxidizing gases such as oxygen. In method (M3), the water solution is a contained in or is derived from the ocean, or a lake, river, underground aquifer, or other natural water body.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The contactor of gas and metal hydroxide contains a catalyst such as carbonic anhydrase to hasten the absorption and hydration of the acid gas. Preferred Apparatus: In the apparatus, the acid-producing anode, and/or hydroxyl-producing cathode together with the water solution are placed within the metal silicate mass to effect removal, excavation, penetration, or reduction in mass of the metal silicate. SPECIFIC COMPOUNDS - Preparation of 6 compounds is specified as the metal hydroxide e.g. calcium hydroxide, magnesium hydroxide, sodium hydroxide, potassium hydroxide, and aluminum hydroxide.    EXAMPLE - No suitable example given.