| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.80 |
| Score | 0% | 56% |
In the metric system, what prefix represents 103?
centi |
|
mega |
|
milli |
|
kilo |
Kilo is the metric system prefix for 103.
Earth's history is divided into time periods, which of these is the longest time period?
eon |
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age |
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era |
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epoch |
The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.
During the water cycle, water enters the atmosphere as a gas through which process?
both evaporation and transpiration |
|
precipitation |
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evaporation |
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transpiration |
The water (hydrologic) cycle describes the movement of water from Earth through the atmosphere and back to Earth. The cycle starts when water evaporates into a gas from bodies of water like rivers, lakes and oceans or transpirates from the leaves of plants.
Blood pressure is generally highest in which of the following?
heart |
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capillaries |
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veins |
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arteries |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.
Earth's breathable air is held in which atmospheric layer?
troposphere |
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thermosphere |
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stratosphere |
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mesosphere |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.