| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.50 |
| Score | 0% | 70% |
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
diaphragms |
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bronchioles |
|
capillaries |
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blood cells |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
Water freezing or boiling is an example of which of the following?
phase transition |
|
sublimation |
|
cooling |
|
heating |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
The hottest of Earth's atmospheric layers is which of the following?
thermosphere |
|
stratosphere |
|
mesosphere |
|
troposphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.
What kind of weather front is likely to create clouds and storms?
warm front |
|
stationary front |
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temperate front |
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cold 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.
A subatomic particle found in the nucleus of an atom. It carries no electric charge. This desribes which of the following?
atom |
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proton |
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neutron |
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electron |
A neutron is a subatomic particle found in the nucleus of an atom. It is neutral as it carries no electric charge.