Igneous Rocks Question Preview (ID: 37215)


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Coarse grained igneous rocks form from
a) sedimentary rocks changed under pressure.
b) large rock particles cemented together.
c) rapidly colling lava.
d) slowly cooled magma.

Igneous rocks can be described as
a) light and easily broken
b) soft and smooth
c) hard and dense
d) soft and dense

Extrusive rocks have _______ grains than intrusive rocks.
a) larger
b) less
c) more
d) smaller

Igneous rocks are classified by their
a) mineral composition
b) origin and texture
c) origin, texture, and mineral composition
d) texture

Magma that is high in silica usually forms
a) quartz
b) basalt
c) granite
d)

Rock formed beneath Earth's surface is
a) extrusive
b) intrusive
c) igneous
d)

Igneous rocks have been used for
a) tools and jewelry
b) tools and windows
c) tools and building materials
d)

Which igneous rock is mixed with soil and used for starting vegetalbe seeds?
a) perlite
b) granite
c) obsidian
d) basalt

A rock used for cobblestones landscaping is
a) slate
b) quartz
c) granite
d) basalt

Which igneous rock is an extrusive rock?
a) porphyry
b) rhylolite
c) pegmatite
d) granite

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