Classifying Rocks: Question Preview (ID: 16626)

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Igneous rock that cools very quickly when it forms may have a texture that is
a) smooth and shiny with no visible grains.
b) multicolored and banded
c) coarse grained
d) made up of jagged grains

When all the grains in a rock are large and easy to see, the rock is described as
a) extrusive
b) fine grained
c) coarse grained
d) nonbanded

To describe a rock's texture, geologists determine
a) the color and density of a rock.
b) how the rock formed.
c) the size, shape, and pattern of the rock's grains.
d) how many minerals the rock contains.

Generally, a rock is made up of
a) large crystals.
b) a mixture of minerals and other materials.
c) small crystals.
d) a compound of several elements.

The texture of slate is said to be ______ because it mineral particles can be seen only with a microscope.
a) jagged
b) banded
c) coarse grained
d) fine grained

Particles of minerals or other rocks are called
a) grains
b) crystals
c) jagged
d) feldspar

_______________ tells the minerals that make up a rock.
a) Texture
b) Grain pattern
c) Grain size
d) Composition

A rock formed deep underground by heat and pressure or chemical reactions is called a(n) _______ rocks
a) sedimentary
b) igneous
c) metamorphic
d) coarse grained

A type of rock formed by the cooling of magma or lava is called a(n) _______ rock.
a) sedimentary
b) igneous
c) metamorphic
d) banded

A type of rock that is formed in layers by the weathering or erosion of rock is called a(n) ___________ rock.
a) sedimentary
b) igneous
c) metamorphic
d) fine grained

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