Igneous Rocks - Comprehension Test

Why does molten rock take large amounts of time to solidify without the presence of cold air or water?

• Molten rock (or lava) cannot solidfy

• The minerals in molten rock (or lava) prevent it from solidifying

Tags

NGSS.MS-PS1-4

What is the difference between magma and lava?

• Both words can be used interchangably.

• Magma and lava contain different minerals

• Molten rock under the ground is called lava and molten rock above the ground is magma.

• Molten rock under the ground is called magma and molten rock above the ground is lava.

What are extrusive igneous rocks?

• When molten rock cools under ground.

• When molten rock cools on the surface of the Earth.

• When water seeps into the mantle.

• Any igneous rock that is formed from the cooling of molten rock.

How does the temperature that magma or lava cools affect the crystal size?

• Molten rock that cools rapidly results in large crystals.

• Molten rock that cools in air will produce larger crystals than magma or lava that cools in water.

• Molten rock that cools slowly will form large crystals.

• Molten rock that cools slowly will form small crystals.

Tags

NGSS.MS-PS3-4

The holes in the extrusive igneous rocks Pumice and Scoria are caused by what?

• Cool air rushing into the rock to help it cool.

• Hot liquids escaping from the cooling lava.

• Hot gases ecaping from the cooling lava.

• Cool liquid rushing into the rock to help it cool.

What can Pumice be used for?

• Abraisive cleaning products.

• As a fuel for camp fires

• A replacement for bricks.

• As a food source.

Tags

NGSS.MS-PS1-3

Scoria is a heavy, dark reddish-brown colour rock that contains minerals with which type of element?

• Silicon

• Iron

• Copper

• Aluminium

Tags

NGSS.MS-PS1-1

Why can basalt have multiple different appearances?

• Some basalt is formed underground.

• The colour of basalt changes due to the presence of different elements/chemicals.

• The gases sucked into the basalt during cooling will change its appearance.

• Mineral crystal size changes depending on the rate of cooling.

Why does obsidian contain no crystals?

• Obsidian contains no minerals and therefore no crystals.

• The crystals did not have time to form due to the speed of cooling.

• The crystals melted due to the excessive heat of the molten rock.

• Obsidian is not a type of igneous rock.

What are Igneous rocks that are formed from magma cooling underground called?

• Minerals

• Extrusive Rocks

• Intrusive Rocks

• Basalt