Unit 2 Lesson 4: Three Classes of Rock

Front

What is a clastic sedimentary rock?

Back

A sedimentary rock formed when rock fragments are squeezed together.

Front

What class of rock is formed by intense heat and pressure?

Back

Metamorphic rock.

Front

What class of rocks forms from the cooling of molten rock or ash?

Back

Igneous rock.

Front

What is an extrusive igneous rock?

Back

A rock formed by the cooling and solidification of lava.

Front

What characterizes extrusive igneous rocks?

Back

They have small or no crystals due to rapid cooling.

Front

What is the main difference between intrusive and extrusive igneous rocks?

Back

Intrusive igneous rocks cool slowly beneath the Earth's surface, while extrusive igneous rocks cool quickly on the surface.

Front

What are sedimentary rocks primarily made of?

Back

They are primarily made of particles from other rocks and organic materials.

Front

What is the process of weathering?

Back

The breaking down of rocks into smaller pieces by natural forces.

Front

What is metamorphism?

Back

The process by which rocks are transformed by heat, pressure, or chemically.

Front

What are the three main classes of rocks?

Back

Igneous, sedimentary, and metamorphic.