| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.14 |
| Score | 0% | 63% |
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
atom |
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neutron |
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proton |
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electron |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
The coldest point in the Earth's atmosphere is reached in which atmospheric layer?
stratosphere |
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thermosphere |
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troposphere |
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mesosphere |
In the mesosphere, temperature again drops as altitude increases until the coldest point in the Earth's atmosphere, the mesopause, is reached where temperatures fall to −225 °F (−143 °C).
Meteoroids, meteors and meteorites are categorized based on which of the following?
their temperature |
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their density |
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their size |
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their location |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
During digestion, where is digested food absorbed into the blood stream?
large intestine |
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small intestine |
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stomach |
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pancreas |
The small intestine is where most digestion takes place. As food travels along the small intestine it gets broken down completely by enzymes secreted from the walls. These enzymes are produced in the small intestine as well as in the pancreas and liver. After the enzymes break down the food, the resulting substances are then absorbed into the blood via capillaries in the small intestine walls.
Changes to an object's speed or direction of motion are caused by which of the following?
kinetic energy |
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work |
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power |
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a force |
Force is applied to change an object's speed or direction of motion.