| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.46 |
| Score | 0% | 69% |
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
spiny |
|
arthropod |
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vertebrate |
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sentient |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Stratus clouds are __________clouds characterized by horizontal layering with a broad flat base.
high-altitude |
|
mid-altitude |
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low-altitude |
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all-altitude |
Clouds are categorized based on their shape, size, and altitude. Stratus clouds are low-altitude clouds characterized by horizontal layering with a broad flat base. When stratus clouds occur on the ground the result is fog.
Which of these is a type of Earth's crust?
terrestrial |
|
sedimentary |
|
oceanic |
|
metamorphic |
The crust is the Earth's outermost layer and is divided into oceanic and continental types. Oceanic crust is 3 miles (5 km) to 6 miles (10 km) thick and is composed primarily of denser rock. Continental crust is 20 to 30 miles (30 to 50 km) thick and composed primarily of less dense rock. The crust makes up approximately one percent of the Earth's total volume.
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
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tides |
|
the northern lights |
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day and night cycle |
Tides are caused by the gravitational interaction of Earth and the Moon.
The two heart chambers that pump blood called:
valves |
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atria |
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ventricles |
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aorta |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.