Geological Time

Front

What does the Law of Superposition state?

Back

Older rocks are on the bottom, Younger rocks are on top.

Front

What type of rocks form from lava at the surface of the Earth?

Back

Extrusive rocks.

Front

What are rocks called that are pressed under water for many years?

Back

Sedimentary rocks.

Front

What does the geological time scale represent?

Back

The revolutionary history of Earth.

Front

What is the Principle of Original Horizontality?

Back

States that sedimentary rocks are originally laid down in horizontal layers.

Front

What are igneous rocks?

Back

Rocks formed from the cooling and solidification of magma or lava.

Front

What are sedimentary rocks?

Back

Rocks formed from the accumulation and compaction of mineral and organic particles.

Front

What are metamorphic rocks?

Back

Rocks that have been changed by heat, pressure, or chemical processes.

Front

What is the difference between intrusive and extrusive rocks?

Back

Intrusive rocks form from magma that cools slowly beneath the Earth's surface, while extrusive rocks form from lava that cools quickly at the surface.

Front

What is a fossil?

Back

The preserved remains or traces of ancient organisms.