| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.57 |
| Score | 0% | 71% |
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets are Earth-like |
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the planets have magnetic fields |
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the planets have moons |
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the planets have water |
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 asteroids in the Kuiper belt are composed of which of the following?
minerals |
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gaseous methane, ammonia, and water |
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frozen methane, ammonia, and water |
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rock |
The Kuiper Belt is similar to the asteroid belt but much larger. Extending beyond the orbit of Neptune, it contains objects composed mostly of frozen methane, ammonia, and water. Most notably, the Kuiper Belt is home to Pluto, a dwarf planet that, until a 2006 reclassification, was considered the ninth planet of the solar system.
The gravitational interaction of Earth and the Moon is responsible for which of these?
tides |
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seasons |
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day and night cycle |
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the northern lights |
Tides are caused by the gravitational interaction of Earth and the Moon.
The rows of the Periodic Table of the Elements are called:
shells |
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families |
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periods |
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groups |
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.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
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vertebrate |
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bone |
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exoskeleton |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.