Igneous Rocks

What is the most common extrusive igneous rock?

• Granite

• Basalt

• Obsidian

• Pumice

How are igneous rocks classified?

• By their color

• By their size

• By their origin, texture, and mineral composition

• By their weight

What type of igneous rock forms when magma hardens beneath Earth's surface?

• Extrusive rock

• Volcanic glass

• Intrusive rock

• Sedimentary rock

Which of the following describes volcanic glass?

• Igneous rock with large crystals

• Igneous rock that lacks minerals with a crystal structure

• Igneous rock with a high silica content

• Igneous rock that forms slowly

What affects the types of rock formed from magma and lava?

• The color of the magma

• The temperature of the magma

• The silica content of the magma

• The speed of the lava flow

Tags

NGSS.MS-ESS2-1

What is the difference between extrusive and intrusive rocks? Give an example of each.

• Extrusive rocks form inside the Earth; intrusive rocks form on the surface. Examples: Granite and Basalt

• Extrusive rocks form on the surface; intrusive rocks form inside the Earth. Examples: Basalt and Granite

• Extrusive rocks are always light; intrusive rocks are always dark. Examples: Obsidian and Pumice

• Extrusive rocks are always dark; intrusive rocks are always light. Examples: Pumice and Obsidian

Explain what causes an igneous rock to have a fine-grained or coarse-grained texture.

• The amount of water present during formation

• The speed at which the rock cools

• The type of minerals present

• The age of the rock

Why are some igneous rocks dark and others light?

• The amount of sunlight they receive

• The type of minerals they contain

• The altitude at which they form

• The amount of water in the environment

Basalt is an extrusive igneous rock. What does this tell you about it?

• it was formed from lava that erupted onto Earth's surface

• it was formed from slowly cooling magma

• it was formed from magma that hardened beneath Earth's surface

Tags

NGSS.MS-ESS2-1

Where do intrusive rocks form?

• Inside the Earth

• In outer space

• At the bottom of the ocean

• On the Earth's surface