| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
In the metric system, what prefix represents 103?
mega |
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kilo |
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centi |
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milli |
Kilo is the metric system prefix for 103.
What part of the nervous system is responsible for controlling involuntary actions like breathing, swallowing, and heartbeat?
cerebrum |
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spinal cord |
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medulla |
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cerebellum |
Part of the brainstem, the medulla is the connection between the brain and the spinal cord. It controls involuntary actions like breathing, swallowing, and heartbeat.
Stratus clouds are __________clouds characterized by horizontal layering with a broad flat base.
low-altitude |
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mid-altitude |
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high-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.
The ozone layer is in which of Earth's atmospheric layers?
mesosphere |
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stratosphere |
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thermosphere |
|
troposphere |
The stratosphere is just above the troposphere and is stratified in temperature with warmer layers higher and cooler layers closer to Earth. This increase in temperature is a result of absorption of the Sun's radiation by the ozone layer.
The Earth's rocks fall into three categories based on how they're formed. Which of the following is formed from the hardening of molten rock?
marble |
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sedimentary |
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metamorphic |
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igneous |
The Earth's rocks fall into three categories based on how they're formed. Igneous rock (granite, basalt, obsidian) is formed from the hardening of molten rock (lava), sedimentary rock (shale, sandstone, coal) is formed by the gradual despositing and cementing of rock and other debris, and metamorphic rock (marble, slate, quartzite) which is formed when existing rock is altered though pressure, temperature, or chemical processes.