| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.31 |
| Score | 0% | 66% |
What part of the food chain serves only as food for other organisms?
decomposers |
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producers |
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secondary consumers |
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primary consumers |
Producers (autotrophs) serve as a food source for other organisms. Typical producers are plants that can make their own food through photosynthesis and certain bacteria that are capable of converting inorganic substances into food through chemosynthesis
Which of the following states of matter exists at the highest temperature?
solid |
|
none of these |
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gas |
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liquid |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Water freezing or boiling is an example of which of the following?
heating |
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sublimation |
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phase transition |
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cooling |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
Which of Earth's layers has weather?
mesosphere |
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thermosphere |
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stratosphere |
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troposphere |
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.
Sound travels fastest through which of the following media?
water |
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metal |
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air |
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vacuum |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).