| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
An air mass is a large body of air that has which of the following characteristics?
similar temperature |
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similar moisture |
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all of these |
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similar density |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.
Cirrus clouds are thin, wispy clouds composed of ice crystals. At what elevation to cirrus clouds form?
low-altitude |
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high-altitude |
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mid-altitude |
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ground level |
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.
In the food chain, bacteria and fungi convert the organic matter in the dead bodies of plants and animals into simple nutrients. Bacteria and fungi are:
primary consumers |
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scavengers |
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decomposers |
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producers |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
What kind of weather front is likely to create clouds and storms?
cold front |
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stationary front |
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temperate front |
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warm front |
A warm front is the boundary between warm and cool (or cold) air when the warm air is replacing the cold air. Warm air at the surface pushes above the cool air mass creating clouds and storms.
Which of these is a type of Earth's crust?
sedimentary |
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oceanic |
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terrestrial |
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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.