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Rocks and Erosion
Look at the layers in the rock. What
kind of rock is this?
It’s sedimentary rock!
The Badlands in South Dakota
Wind and sand has caused continued weathering of the
soft sedimentary rock.
Look at the layers of sediment. It tells you about
the weather during the time the particles were
deposited. The larger the sediment, the heavier
and faster the flow of water.
Look at the boulders way up on top!
Next, larger stones were left
Then, this mud was deposited.
These large stones were
deposited first.
Small plants, called lichens, make small cracks in the rock. Seeds can fall in the crack and grow.
As the plants grow, their roots make larger cracks.
Water can get in the cracks and freeze. That makes the cracks larger. Eventually
the rock will break, or weather.
This hill is an example of soil erosion. Although trees help hold soil in place, the
steep hill makes it easy for rainwater to carry soil downhill.
This is a red granite quarry in Wisconsin. Red granite is Wisconsin’s state rock.
Granite is very hard so buildings and monuments are often made of it.
What kind of rock
is granite?
Granite can be many different colors, but it all has large crystals.
It is an igneous rock!!
Granite is created from magma that cools
inside the earth, so crystals have more time
to grow.
Diamond Head is a inactive volcano in Hawaii. The islands were
created from underwater volcanoes. They are mainly igneous rock.