6. fossils are remains of organisms found in sedimentary rock. these remains are found in thousands of rock layers around the world and provide evidence for earth's long history of changing lifeforms.

rock layers that formed more recently
contain fossils of animals only.

contain fossils of plants only.

contain fossils that resemble existing species less closely than do fossils found in older rock layers.

contain fossils that resemble existing species more closely than do fossils found in older rock layers.

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .

Salt in oceans comes from and of rocks