Igneous Rocks

Igneous rocks are formed by the __________ and ___________ of molten lava or magma.

(a)  

Sandstone is a type of igneous rock.

• True

• False

Magma is molten rock (a)   Earth's surface.

The upper section of the Earth's (a)   is made up of around 95% igneous rock.

Many _________________ are made up of igneous rocks.

• rivers

• lakes

• mountains

• plateaus

Mountains with lots of surrounding igneous rock suggest that it could be a (a)   .

In the lab, most rocks must be ___________ to temperatures of 800 degrees Celcius before they _________.

• cooled; melt

• heated; freeze

• cooled; freeze

• heated; melt

Tags

NGSS.MS-PS1-4

_______ is formed when lava is cooled quickly above ground. This rock is light, and some can float.

• Obsidian

• Basalt

• Pumice

• Granite

__________ forms when lava cools quickly. These are found on the ocean floor and are very hard rock.

• Pumice

• Granite

• Basalt

• Obsidian

_________ is made of many quartz and feldspar pieces that are stuck together. This comes in different colors and is a very hard stone.

• Basalt

• Granite

• Pumice

• Obsidian