| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Changes to an object's speed or direction of motion are caused by which of the following?
work |
|
power |
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kinetic energy |
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a force |
Force is applied to change an object's speed or direction of motion.
Which of Earth's layers has weather?
thermosphere |
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stratosphere |
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troposphere |
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mesosphere |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.
In the food chain, bacteria and fungi convert the organic matter in the dead bodies of plants and animals into simple nutrients. Bacteria and fungi are:
decomposers |
|
scavengers |
|
primary consumers |
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producers |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
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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electron |
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neutron |
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proton |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
Which of the following is the primary difference between a comet and an asteroid?
comets orbit the Sun |
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comets have an atmosphere |
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asteroids have a coma |
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asteroids contain frozen water |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.