Rock Layers and Fossils Concepts

Front

What does The Law of Superposition state?

Back

A layer of rock is older than the layer on top of it and younger than the layer below it.

Front

According to The Law of Superposition, which layer is older: Layer 2 or Layer 3?

Back

Layer 2 is old relative to layers 3 and 4.

Front

What are fossils?

Back

Naturally-preserved remains or impressions of organisms that lived long ago.

Front

What is an index fossil?

Back

An organism that existed for a relatively short period of time, was abundant, and had a wide geographical distribution.

Front

Which property is NOT characteristic of useful index fossils?

Back

The organisms still exist today.

Front

What is stratigraphy?

Back

The study of rock strata to determine the history of the land.

Front

What type of rock is primarily associated with fossils?

Back

Sedimentary rock.

Front

What is the significance of sedimentary layers in geology?

Back

They provide a record of Earth's history and past environments.

Front

How do fossils help in dating rock layers?

Back

Fossils can indicate the relative age of the rock layers in which they are found.

Front

What is the principle of original horizontality?

Back

Layers of sediment are originally deposited horizontally under the action of gravity.