Front

What is the youngest layer of rock called?

Back

The youngest layer of rock is the one on top.

Front

Which layer of rock is the newest?

Back

Layer A is the newest.

Front

What do changes in the Earth over time indicate?

Back

Changes in the Earth over time show us that Earth used to look very different.

Front

What type of fossil might you find in layer 1?

Back

You might find a fern fossil in layer 1.

Front

What kind of environment did starfish fossils indicate?

Back

Starfish fossils indicate that the environment was an ocean.

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of a living organism from the past.

Front

What do sedimentary rocks often contain?

Back

Sedimentary rocks often contain fossils.

Front

How do fossils form?

Back

Fossils form when organisms are buried by sediment and over time, minerals replace the organic material.

Front

What is the principle of superposition?

Back

The principle of superposition states that in undisturbed layers of rock, the oldest layers are at the bottom and the youngest are at the top.

Front

What can fossils tell us about Earth's history?

Back

Fossils can tell us about the types of organisms that lived in the past and how environments have changed.