Question

Fossils are generally found in
A. Sedimentary rocks
B. Igneous rocks
C. Metamorphic rocks
D. Any type of rock

Answer 1

Hint: There are three types of rocks that can be found within the earth's surface, which are metamorphic, igneous, and sedimentary rocks. Fossils are primarily found in rocks that are formed over time and have lesser pressure and heat as compared to metamorphic and igneous rocks enabling the preservation of fossils over millions of years.

Complete answer:
Rocks are classified based on how they are formed within the earth's crust. Namely, there are three types of rocks found within the crust, that are metamorphic, igneous, and sedimentary rocks.
-Metamorphic rocks are formed from either igneous or sedimentary rocks that undergo metamorphism due to increased pressure and temperature which leads to change in their physical and chemical properties.
-Igneous rocks are rocks formed from molten lava that have been cooled or solidified, therefore they are also called magmatic rocks. Sedimentary rocks are rocks formed from the sediment of mud and sand over time and pressure.
-Fossils are preserved bones of prehistoric animals which are primarily found in sedimentary rocks. This is because as the organisms die, their body is usually covered by other plants and leaves but mainly mud and sand which slowly settle all over the dead organism. And with years and years of settling and sedimentation with enough pressure, they become rocks. The slow sediment and less pressure in sedimentary rock formation compared to igneous and metamorphic rocks ensure that the remains are preserved effectively.
Therefore, the correct answer is A.

Note: Some fossils are also found in igneous and metamorphic rocks but are extremely rare. Igneous and metamorphic rocks are subject to intense heat and pressure which usually does not preserve the fossils.