Chapter 4 Lesson 2

What type of rocks form when gases are releases in molten rock?

• Basalt

• Obsidian

• Granite

• Pumice

What type of rock is an example of volcanic glass?

• Obsidian

• Granite

• Diorite

• Basalt

What is a rock material that forms when rocks are broken down into smaller pieces or dissolved in water as rocks erode?

• Grains

• Magma

• Sediment

• Texture

What is a natural, solid mixture of minerals or grains?

• Crystal

• Mineral

• Gemstone

• Rock

What word describes the size and fit of grains in rocks?

• Texture

• Hardness

• Composition

• Sediment

What are the fragments that make up a rock called?

• Grains

• Pieces

• Boulders

How do geologists classify igneous rocks?

• Texture

• Mineral Composition

• Color

What rock forms when molten rock cools and crystallizes

• Igneous

• Sedimentary

• Metamorphic

Extrusive rocks form when ____ cools and crystallizes quickly

Intrusive rocks form when _____ cools and crystallizes slowly