| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.36 |
| Score | 0% | 67% |
The gravitational interaction of Earth and the Moon is responsible for which of these?
day and night cycle |
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seasons |
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the northern lights |
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tides |
Tides are caused by the gravitational interaction of Earth and the Moon.
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.
Tertiary consumers eat which of the following?
primary and secondary consumers |
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all of these |
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decomposers |
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producers |
Tertiary consumers eat primary consumers and secondary consumers and are typically carnivorous predators. Tertiary consumers may also be omnivores. Examples include wolves, sharks, and human beings.
Which of the following is not true about mass and weight?
mass depends on the location where it is measured |
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weight depends on the location where it is measured |
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mass is the amount of matter something has |
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weight is the force exerted on an object by gravity |
Mass is the amount of matter something has while weight is the force exerted on an object's mass by gravity. So, although a person's mass doesn't change when going from the Earth to the Moon, their weight will decrease because the force of the Moon's gravity is much less than that of Earth.
The heart __________ blood.
filters |
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oxygenates |
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creates |
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deoxygenates |
To provide oxygen to the body, blood flows through the heart in a path formed by the right atrium → right ventricle → lungs → left atrium → left ventricle → body. When blood enters the right side of the heart it is deoxygenated. It enters the left side of the heart oxygenated after traveling to the lungs.