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31 Cards in this Set
- Front
- Back
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What do we call the wearing
away of the earth's topsoil? |
erosion
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What do we call it when we
use natural resources wisely? |
conservation
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What do we call massive rivers
of ice that move very slowly? |
glaciers
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What do we call the matter
that settles to the bottom or sides of a body of water? |
sediment
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What do we call a deposit of
sand and soil that has dropped at the mouth of some rivers? |
a delta
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The delta formed by sediment
at the mouths of some rivers usually has a ________ shape. |
triangular
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What do we call the hot,
liquid rock that sometimes is found in the earth's mantle below the earth's crust? |
magma
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What kind of rocks occur when
hot magma cools down and becomes solid? |
igneous
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What solid rock forms when
liquid rock cools slowly underground? |
granite
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What rock forms most of the earth's
crust under the continents? |
granite
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What two kinds of rock form
when liquid rock cools quickly after coming out of a volcano? |
pumice
obsidian |
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What kind of rock is so full
of air holes that it will sometimes float? |
pumice
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What shiny and smooth black
rock was used by Indians to make arrowheads? |
obsidian
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What general class of rock is
formed when sediment is pressed together under the earth or sea? |
sedimentary rock
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What kind of rock is formed
when layers of sand are pressed down under the sea? |
sandstone
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What kind of rock contains
pebbles or cobbles cemented together? |
conglomerate
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What rock can be made from
the shells of sea creatures? |
limestone
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What do we use for writing on
blackboards that comes from fine-grained limestone that didn't harden into a rock? |
chalk
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What kind of sedimentary rock
can be made from mud or clay? |
shale
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What do we call rock whose form
has been changed by heat and pressure? |
metamorphic rock
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What beautiful kind of rock
is a metamorphic rock made from limestone? |
marble
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What rock are the following
all made from? The Washington Monument The Lincoln Memorial The Jefferson Memorial |
marble
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What metamorphic rock comes from
shale whose form has been changed by heat and pressure? |
slate
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What metamorphic rock is used
to make blackboards? |
slate
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Rare and costly minerals such as
DIAMONDS, RUBIES, and EMERALDS are called _____. |
gems
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TRUE/FALSE
The decayed material in soil is called GRAPHITE. |
FALSE
Replace the capitalized word with HUMUS. |
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A mineral is never ____-____
and never made of things that were once ____. |
man-made
alive |
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Which layer of soil contains
the fertility needed to support plant life? |
topsoil
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What is an important job of humus in the top soil?
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It holds the water in the soil.
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Scientists have divided rocks
into _______ (number) main groups. |
three
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What layer of soil is worn
away by erosion? |
topsoil
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