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Topic Sentence
100
Geology is the study of the solid matter that makes up the Earth. It includes studying the types of rocks the Earth is made of. Geologist, the scientist who specializes in geology, study many things. They look at how the Earth continues to change over time. Geologist even study rocks to find out what the Earth was like millions of years ago.
Geology is the study of the solid matter that makes up the Earth.
200
The centipede is a hunter. It poisons its prey with a quick bite. It stalks its prey in dark places beneath stones, logs, and piles of leaves. It eats silver fish, cockroaches, worms, and slugs.
The centipede is a hunter.
300
Earthquakes are caused when the plates of the Earth's crust move. Earthquakes happen along "fault lines" in the earth’s crust. When the plates in the Earth suddenly shift, the Earth will begin to shift, shake or tremble.
Earthquakes are caused when the plates of the Earth's crust move.
400
The sight of a mountain pouring out smoke and red hot lava is one of the most amazing in all of nature. A volcano is an opening in the Earth's crust that allows molten rock to escape. This molten rock, or lava, cools after it escapes and becomes igneous rock.
A volcano is an opening in the Earth's crust that allows molten rock to escape.
500
When water is forced upward through sand by a natural spring or some other source, the grains of sand are pushed apart and the sand swells. When this happens, the sand is no longer firm and cannot support heavy weight. It becomes quicksand. If the water drains or stops running, the quicksand turns into plain sand. So quicksand is not a special kind of sand, but it is the result of water trying to move through plain old sand.
So quicksand is not a special kind of sand, but it is the result of water trying to move through plain old sand.