None, the answer would be 2500
biotic- living things
abiotic- non living things
I think the answer is b not too sure though
Answer:
Explanation:
Why are layers of rocks related to each other?
Layering, or bedding, is the most obvious feature of sedimentary rocks. ... This Law of Superposition is fundamental to the interpretation of Earth history, because at any one location it indicates the relative ages of rock layers and the fossils in them. Layered rocks form when particles settle from water or air.
Radioactivity due to heavy elements
Friction caused by earths fast rotation
