| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.36 |
| Score | 0% | 67% |
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets have moons |
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the planets have water |
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the planets are Earth-like |
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the planets have magnetic fields |
The four planets closest to the Sun (Mercury, Venus, Earth, and Mars) are called terrestrial (Earth-like) planets because, like the Earth, they're solid with inner metal cores covered by rocky surfaces.
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.
Cirrus clouds generally occur in what kind of weather?
hot |
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fair |
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freezing |
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stormy |
Cirrus clouds are thin, wispy high-altitude clouds composed of ice crystals that originate from the freezing of supercooled water droplets. Cirrus clouds generally occur in fair weather and point in the direction of air movement at their elevation.
Changes to an object's speed or direction of motion are caused by which of the following?
kinetic energy |
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a force |
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power |
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work |
Force is applied to change an object's speed or direction of motion.
The gravitational interaction of Earth and the Moon is responsible for which of these?
day and night cycle |
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tides |
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the northern lights |
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seasons |
Tides are caused by the gravitational interaction of Earth and the Moon.