Practice Test

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PRACTICE TEST: Answer these questions the day before your exam as a final check on your understanding of the chapter’s terms and concepts.

This activity contains 17 questions.

Matching:

A matching question presents 17 answer choices and 17 items. The answer choices are lettered A through Q. The items are numbered 1.1 through 1.17. 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.

	tabular pluton
	basalt and gabbro
	slow cooling rate; pegmatites formed
	intrusive or plutonic
	discordant igneous body
	lithos
	assimilation
	Bowen’s reaction series
	pumice
	xenolith
	concordant tabular pluton
	batholiths
	MORBs
	rapid cooling rate; glass formed
	country rock
	ferromagnesians
	porphyritic texture

1.1 magmas that enter preexisting rocks
1.2 surrounding rock incorporated into magma
1.3 unmelted rock fragment enclosed by magma
1.4 oceanic crust igneous rock types
1.5 complete sill technical description
1.6 magma cools; no crystals form
1.7 magma cools; very large crystals form
1.8 igneous texture with multiple crystal sizes
1.9 lava cools instantly; gas is trapped within
1.10 unmelted rock adjacent to magma body
1.11 Greek for rock or stone
1.12 high iron- and magnesium-content silicates
1.13 idealized silicate mineral formation order
1.14 slab-like igneous intrusions; broader than thick
1.15 basalts formed at oceanic plate divergent boundaries
1.16 plutons that cut across country rock
1.17 large, massive, discordant plutons

Rocks do not all melt at the same temperature because:

extrusive rocks are cooler than intrusive rocks.each rock type has its own melting point.different rocks contain different minerals.some rocks are larger than other rocks.

The large stretches of felsic rock on our continents probably originated by:

fractional crystallization of magma.crystal filtering from magma.crystal settling of magma.assimilation of adjacent country rock by magma.

Discordant intrusions:

contain different minerals than adjacent rock.cut across layers of preexisting rock.lie in a vertical position.lie in a horizontal position.

A basalt containing significant amounts of sodium, potassium, and magnesium probably originated as:

magma from the continental crust.magma from the oceanic crust.magma from the upper mantle.magma from the lower mantle.

Plutons are classified by:

composition, texture, and orientation.size, orientation, and shape.orientation, composition, and mass.orientation, size, and texture.

A sill always:

lies between preexisting layers.lies vertically.lies horizontally.bulges upward.

When two liquids of different density merge:

they attract each other by their charges.they must be in water to move.they form gas bubbles by friction.the denser of the two is pulled down by gravity.

Variable composition of continental basalts infers:

assimilation of continental rocks.partial melting of deep mantle rocks.partial melting of shallow mantle rocks.All of the above.

	Minerals both melt and crystallize at the same temperature.
	Minerals both melt and crystallize at the same temperature.
	True False

	Assimilation can produce a magma body with a hybrid or mixed composition.

	True False

	Bowen’s continuous series predicts the sequence of each atomic chemical reaction.

	True False

	Felsic magmas with a high water content may reach the Earth’s surface as rhyolite.

	True False

	Gold ore deposits can form by crystallization of materials dissolved in hot water solutions.

	True False

	Basalts in oceanic settings vary more than their continental counterparts.

	True False

	Since batholiths are deep-seated and cool slowly, their texture is uniform throughout.

	True False

	Partial melting refers to large minerals that do not have time to be completely dissolved.

	True False

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Practice Test

Matching:

Rocks do not all melt at the same temperature because:

The large stretches of felsic rock on our continents probably originated by:

Discordant intrusions:

A basalt containing significant amounts of sodium, potassium, and magnesium probably originated as:

Plutons are classified by:

A sill always:

When two liquids of different density merge:

Variable composition of continental basalts infers:

Minerals both melt and crystallize at the same temperature.

Assimilation can produce a magma body with a hybrid or mixed composition.

Bowen’s continuous series predicts the sequence of each atomic chemical reaction.

Felsic magmas with a high water content may reach the Earth’s surface as rhyolite.

Gold ore deposits can form by crystallization of materials dissolved in hot water solutions.

Basalts in oceanic settings vary more than their continental counterparts.

Since batholiths are deep-seated and cool slowly, their texture is uniform throughout.

Partial melting refers to large minerals that do not have time to be completely dissolved.