Concept 2 Quiz

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List some of the most common igneous rocks and use them to explain how igneous rocks form and are classified.

This activity contains 10 questions.

	Over time, magma will crystallize to form igneous rocks.
	Over time, magma will crystallize to form igneous rocks.
	True False

Molten material found inside Earth is called

plasmamagmarock fluidmineraloidlava

Why can two igneous rocks have the same minerals but different names?

The rocks may be of different sizes.Names of igneous rocks are arbitrary.They may have different textures.They may have been found in different places.They may have different colors.

	The most common extrusive igneous rock is granite.
	The most common extrusive igneous rock is granite.
	True False

	Igneous rocks are the rock type most likely to contain fossils.

	True False

Correctly match the igneous rock pairs by composition. Each pair should represent different textures based on the origin of formation.

A matching question presents 3 answer choices and 3 items. The answer choices are lettered A through C. The items are numbered 6.1 through 6.3. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column.

	basalt
	rhyolite
	andesite

6.1 granite
6.2 gabbro
6.3 diorite

Quenching of molten material is an important step in the formation of igneous rocks such as

graniteobsidianchertpegmatitesnone of the above

	Granite exhibits a coarse-grained texture.
	Granite exhibits a coarse-grained texture.
	True False

Igneous rocks are classified by

texture and mineral compositionassimilationtexturemineral compositionall of the above

	The size of mineral crystals in igneous rocks is greatly influenced by the rate of magma cooling.

	True False

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Concept 2 Quiz

Over time, magma will crystallize to form igneous rocks.

Molten material found inside Earth is called

Why can two igneous rocks have the same minerals but different names?

The most common extrusive igneous rock is granite.

Igneous rocks are the rock type most likely to contain fossils.

Correctly match the igneous rock pairs by composition. Each pair should represent different textures based on the origin of formation.

Quenching of molten material is an important step in the formation of igneous rocks such as

Granite exhibits a coarse-grained texture.

Igneous rocks are classified by

The size of mineral crystals in igneous rocks is greatly influenced by the rate of magma cooling.