Geological Time

Front

What type of rock is formed from fire and lava?

Back

Igneous

Front

What do we call rocks that form from lava at the surface of the Earth?

Back

Extrusive

Front

What does the Principle of Original Horizontality state?

Back

Sedimentary rocks are originally laid down in horizontal layers.

Front

What type of rock is formed from sediments pressed under water for many years?

Back

Sedimentary

Front

How old is the Earth?

Back

4.6 Billion years old.

Front

What type of rock forms from the cooling and solidification of magma?

Back

Igneous.

Front

What is the difference between intrusive and extrusive igneous 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 are sedimentary rocks primarily made of?

Back

Particles of sand, silt, clay, and organic materials.

Front

What is the process called when sediments are compacted and cemented together?

Back

Lithification.

Front

What type of rock is formed under extreme heat and pressure?

Back

Metamorphic.