Question 9 0.33 pts Why are index fossils helpful for interpreting the correct o

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Question 9 0.33 pts Why are index fossils helpful for interpreting the correct order for rock strata? C You cannot tell f rocks in Devon and Ohio were laid down at the same time. Fossils are radioactive and can be dated using radioactive decay C All rock has fossils of dinosaurs The fossils of a species are only found in one kind of sedimentary rock CRock types can repeat in strata, but evolution did not repeat the same species. Question 10 0.34 pts What is causing the basin and range system in the American West? o, the spreading of the crust paleomagnetism the compression of the crust gleciers the eruption of volcanos

Explanation / Answer

Answer 9 : Rock types can repeat in a strata but evolution did not repeat the same species.

Explanation : Index fossils are useful because they have a very short vertical range but a wide horizontal range which means that they existed for only a short span of time but they are found in many places of the world which helps in correlation. They are never repeated in space and time.

Answer 10 : the spreading of the crust.

Explanation : Basin and range topography is mainly formed by the extension or spreading of the crust which results in normal faulting causing subsequent elevations and depressions.

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