History of Planet Earth

Front

What is the oldest layer of rock?

Back

Layer 1 is the oldest layer of rock.

Front

What is the youngest layer of rock?

Back

Layer 5 is the youngest layer of rock.

Front

How do rock strata shift?

Back

Rock strata can shift due to earthquakes, folding, or sediment deposition.

Front

What is sedimentary rock?

Back

Sedimentary rock is formed from particles of sand, shells, and other fragments that are pressed together.

Front

What evidence supports the extinction of dinosaurs?

Back

The fossil record provides evidence that dinosaurs became extinct 65 million years ago.

Front

What are rock strata?

Back

Rock strata are layers of rock that have formed over time.

Front

What does it mean if rock layers are horizontal?

Back

Horizontal rock layers indicate that they were deposited in calm water.

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of a once-living organism.

Front

What is the Grand Canyon known for?

Back

The Grand Canyon is known for its layers of sedimentary rock and geological history.

Front

What is weathering?

Back

Weathering is the process that breaks down rocks into smaller pieces.