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The Rock Cycle
Sedimentary
Metamorphic
Igneous
This story begins at the bottom of
an ancient lake bed.
Many streams and rivers ran down
the mountains and into the lake.
The slow moving streams deposited
a green layer of fine silt.
Then the rainfall increased! The stream
began moving more rapidly and picked
up huge boulders that were deposited
on top of the green silt
Then there was a drought and the
river was no longer rushing quickly.
The slow moving river could still carry
sand. A layer of sand was deposited
on top of the large boulders.
It began to rain more, once again and
the river picked up large boulders,
which were deposited into the lake bed
on top of the sand.
The river began moving faster and
picked up more fine green silt and
deposited it on top of the boulders.
Millions of years later, the lake dried up.
Years later, a stream cut through one
corner of the lake bed exposing layers
of sedimentary rock.
Over the next few thousand years,
something exciting happens. Hot
magma begins to push towards the
surface of the earth.
The rocks become super heated and
are under tremendous pressure.
They changed into metamorphic rocks
Millions of years later, humans came
along and wanted to build a road
through the ancient lake bed.
Part 2
Over the next few million years
the wind, rain, streams and
waves completely erode the
ancient lake bed.
Tons upon tons of metamorphic
rock are transported to the ocean
and deposited in the bottom of the
ocean. This created a huge layer of
sediment.
These sediments lie on top of a
place where two huge plates
come together.
This collision causes dangerous
volcanoes to form.
Then a stream cuts through the
side of the volcano and erodes part
of it away.
• More sediment, pebbles, sand,
and silt are made. The rock cycle
continues to change our Earth.
Similarities
• Use one of the sentence frames below to
write a sentence about how two of the
types of rock are alike.
• Igneous rocks and metamorphic rocks are
similar because…
• Both sedimentary and metamorphic rocks
have….
• Igneous rocks are like sedimentary rocks
because they both…
Differences
• Use one of the sentence frames below to
write a sentence about how two of the types
of rock are different.
• Igneous rocks and metamorphic rocks are
different because…
• Sedimentary and metamorphic rocks have
many differences such as….
• Igneous rocks are different from sedimentary
rocks because…