| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.20 |
| Score | 0% | 64% |
Large, puffy, mid-altitude clouds with a flat base and a rounded top describe which of the following?
stratus clouds |
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cumulus clouds |
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fog |
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cirrus clouds |
Cumulus clouds are large, puffy, mid-altitude clouds with a flat base and a rounded top. These clouds grow upward and can develop into a cumulonimbus or thunderstorm cloud.
The rate of vibration of sound is called:
volume |
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frequency |
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period |
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amplitude |
The rate of vibration of sound is called frequency and is measured in hertz (Hz). One hertz is one repetition per second and sounds with high frequency have a higher pitch than sounds with lower frequency. Humans can hear sounds in the range of 20 Hz to 20 kHz.
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
protons |
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atomic mass units |
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electron shells |
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electrons |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
In the foood chain, producers 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:
decomposition |
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photosynthesis |
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autotrophs |
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chemosynthesis |
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 is not a method of heat transfer?
radiation |
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convection |
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reflection |
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conduction |
Heat is always transferred from warmer to cooler environments through conduction, convection, or radiation.