Question

What are fossils?


Fossils are layers of rock.


Fossils are old bits of plants and animals. They turn into rock over a long time.


Fossils are a type of map.


Fossils are like earthquakes.

Answer 1

Correct answer: Fossils are old bits of plants and animals (and other evidence of ancient life) that have been preserved in rock over long time.

Short explanation
- Fossils are the preserved remains or traces of once‑living organisms (bones, shells, leaves, footprints, burrows, etc.).
- Most form when remains are buried in sediment and mineral-rich water replaces or fills the tissues (permineralization, replacement, carbonization), or when organisms become trapped in substances like amber.
- Fossils are usually found in sedimentary rock layers.

Why the other choices are wrong or only partially right
- "Fossils are layers of rock." — No. Layers of rock are called strata; fossils are found in those layers, but a fossil is the preserved organism or trace, not the layer itself.
- "Fossils are a type of map." — Not literally. However, fossils (especially index fossils) can be used by scientists to correlate rock layers and reconstruct past environments and the sequence of events, so they can serve as a kind of guide to Earth’s history.
- "Fossils are like earthquakes." — No. Earthquakes are sudden movements of Earth’s crust; fossils are preserved evidence of past life. They are different phenomena.