Igneous Rocks Question Preview (ID: 37215)


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

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

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

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

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

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

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

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.

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

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

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