GEOLOGY
STRATIGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Igneous rocks are formed after sedimentary rocks.
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Igneous rocks are deposited like sedimentary rocks.
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Igneous rocks are made up of harder minerals than sedimentary rock.
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Igneous rocks are formed from molten rock, while sedimentary rocks are formed from compacted sediments.
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Detailed explanation-1: -Reason for sedimentary rocks to be the only rock type to contain fossils: The dead plants and animals, where they are buried by more sediment results in the accumulation of minerals from water in bones which leads to formation of fossils. This makes sedimentary rocks the only rock type to contain fossils.
Detailed explanation-2: -This is because they are already in locations where sediment is likely to bury them and shelter them from scavengers and decay. Mudstone, shale, and limestone are examples of sedimentary rock likely to contain fossils.
Detailed explanation-3: -Igneous and metamorphic rocks experiences too much changes in temperature and pressure, due to which fossils can not be preserved in these rocks. The pressure and temperature in sedimentary rocks is quite less, that helps in the preservation of fossil fuels. Therefore, fossils are found only in sedimentary rocks.
Detailed explanation-4: -Sedimentary rocks have the ability to retain fossils because unlike most igneous and metamorphic rocks, sedimentary rocks occurs at temperatures and pressure that do not obliterate fossil remnants. Therefore, fossils are found in sedimentary rocks.
Detailed explanation-5: -There are no fossils found in igneous rocks because the high temperature destroys the remains of plants and animals in it.