25 terms

Rocks and Minerals Unit Grade 4

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Terms in this set (...)

rock
a solid made of one or
more minerals (noun)
mineral
a material that is found in
nature and that has never
been alive (noun)
rock cycle
the continuous series
of changes that rocks
undergo (noun)
igneous rock
rock that forms when
melted rock from inside
Earth cools and hardens
(noun)
metamorphic rock
rock that forms when
two other kinds of rock
are changed by heat and
pressure (noun)
sedimentary rock
rock that forms when
sediment, or sand and
small bits of stone are
cemented, or glued
together (noun)
nonmetallic mineral
a mineral that does not contain metal and is dull with no luster (noun)
metallic mineral
a mineral that is shiny like
a metal (noun)
luster
the way the surface of
a mineral reflects light
(noun)
streak
a colored line that is
left behind when some
minerals are rubbed
against a rough surface
(noun)
hardness
a measure of how easily a
mineral can be scratched
(noun)
cleavage
a property of some
minerals that causes them
to break apart along flat
surfaces (noun)
sediment
the materials that settle
and pack together to form
sedimentary rock (noun)
weathering
the breaking up or wearing
away of rock (noun)
erosion
the process of carrying
weathered rock from one
place to another (noun)
glacier
a large mass of slow-
moving ice (noun)
deposition
the dropping of sediment
moved by water, wind, and
ice (noun)
delta
a large mass of sediment
deposited at the mouth of
a river (noun)
soil
the loose material that
covers much of Earth's
surface (noun)
humus
the decayed remains of
plants and animals (noun)
topsoil
the upper layer of soil that
contains minerals and
humus (noun)
subsoil
the layer of soil just below
the topsoil (noun)
bedrock
unweathered rock that lies
below the lowest layer of
soil (noun)
fossil
the very old remains of a
once-living plant or animal
(noun)
paleontologist
a scientist who studies the
fossils and forms of life
that no longer exist (noun)
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