Three Types of Rocks

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Three Types of Rocks
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N SPI 0707.7.2
Label a diagram that depicts the three different
rock types.
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3 TYPES OF ROCKS IGENOUS SEDIMENTARY METAMORPHIC

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IGNEOUS ROCKS
BALSALT
LAVA
PERLITE
OBSIDIAN
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SEDIMENTARY
AGATE
LIMESTONE
BANDED IRON FORMATION
ASPHALT
SHALE
BRECCIA
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METAMORPHIC
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IGNEOUS ROCK
WHAT IS A ROCK?
A rock is a mixture of certain minerals,
volcanic glass, organic matter, or other
materials.
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CLASSIFICATION OF ROCKS Rocks are classified
according to the way in which they are formed.
There are three types of rocks igneous,
sedimentary, and metamorphic.
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IGNEOUS ROCKS Igneous rocks form when hot,
molten earth materials cool and harden. Some
form from lava.
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INTRUSIVE OR EXTRUSIVE Igneous rocks are
intrusive or extrusive depending how they are
formed. One way to further classify these rocks
is by the magma from which they form.
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FORMATION OF IGNEOUS ROCKS FROM LAVA An igneous
rock can form from basaltic, andesitic or granite
magma.
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TYPE OF MAGMA The type of magma that cools to
form an igneous rock is determines important
chemical and physical properties of that rock.
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EXAMPLES OF IGNEOUS ROCKS Granite Obsidian Pum
ice
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SEDIMENTARY ROCKS Sedimentary rocks are formed
when bits of fragments of earth called sediments,
are pressed together.
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SEDIMENTARY ROCKS Sedimentary rocks form when
bits or fragments of earth called sediments, are
pressed or cemented together by earths
processes. 75 of earths visual rocks are
sedimentary rocks.
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LAYERS OF SEDIMENTARY ROCKS Sedimentary
rocks are usually formed as layers. Layers are
formed when trash is discomposed and when loses
energy and deposits sand and other materials.
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HOW DIFFERENT LAYERS ARE FORMED Older layers of
rocks are at the bottom from hundreds of
thousands of years ago. Younger layers of rocks
at the top are things that we deposit yesterday
and today.
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CLASSICATION OF SEDIMENTARY ROCKS Sedimentary
rocks are classified by their composition and by
the manner in which they are formed. Sediments
come from weathered and eroded igneous,
metamorphic, and sedimentary rocks.
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EXAMPLES OF SEDIMENTARY ROCKS Sandstone Silt Cla
y Sand Coal Gravel Limestone (chalk) Rock
Salt
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METAMORPHIC ROCKS Metamorphic rocks are
rocks that form from exiting
rocks. They morph!!
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THREE WAYS ROCKS MORPH! Rocks change when they
are subjected to the intense heat associated
with volcanoes or with bodies of magma.
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THREE WAYS ROCKS MORPH! Cont. Rocks morph
when they are exposed to intense pressures from
overlying rocks and sediments.
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THREE WAYS ROCKS MORPH! Cont. Rocks morph
when hot, mineral- rich waters come into contact
with rocks.
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FOLIATED METAMORPHIC ROCKS Foliated rocks form
when mineral grains flatten and line up in
parallel layers. Two examples are slate and
gneiss.
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EXAMPLES OF METAMORPHIC ROCKS Gneiss Marbl
e Slate Schist
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NONFOLIATED METAMORPHIC ROCKS Layering does
always occur in metamorphic rocks. The minerals
grains grow and rearrange, however they do not
form layers. The grains grow and interlockl
like a jigsaw puzzle.
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