GEOLOGY

EARTH SCIENCE

FOSSILS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In which rock type do we usually find fossils?
A
igneous
B
metamorphic
C
sedimentary
D
None of the above
Explanation: 

Detailed explanation-1: -Among the three major types of rock, fossils are most commonly found in sedimentary rock. Unlike most igneous and metamorphic rocks, sedimentary rocks form at temperatures and pressures that do not destroy fossil remains.

Detailed explanation-2: -Fossils are typically found in sedimentary rocks and occasionally some fine-grained, low-grade metamorphic rocks. Sometimes the fossils have been removed, leaving moulds in the surrounding rock, or the moulds may have later been filled by other materials, forming casts of the original fossils.

Detailed explanation-3: -Fossils are formed when a plant or animal dies. Their soft tissues decomposes quickly, leaving the hard bones or shells behind. Over time, sediment builds over the top and hardens into rock. Therefore, one may find fossils 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: -Chemical sedimentary rocks can be found in many places, from the ocean to deserts to caves. For instance, most limestone forms at the bottom of the ocean from the precipitation of calcium carbonate and the remains of marine animals with shells.

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