Answer:
Fossils may be defined as the remains of the organisms which have been preserved in the form of moulds or casts in rocks etc. since pre-historic ages. When a plant or an animals dies, their remains fall on the ground. Over a period of time their body gets covered by sediments brought by rivers winds. These sediments keeps on getting accumulated for over hundreds of years and when that land gets eroded, the fossils can be seen. The age of the fossils can be determined by the following ways. (a) Radiometric dating: The age of fossil can be determined by tracing the radioactive elements present in the rocks and examining its traces. (b) Relative dating: The fossils found in the sedimentary rocks in the form of layers accumulated over large span of time. So using this fact, age of the fossils can be found by knowing where the fossils were present in the layer. Fossil found at the bottom is older than found above them.
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