| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.52 |
| Score | 0% | 70% |
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
convection |
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conduction |
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reflection |
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radiation |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
Blood is created in:
bone marrow |
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the heart |
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red blood cells |
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the liver |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
A transition zone between two air masses is called:
thunderstorm |
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boundary |
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fog |
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front |
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.
The Sun is a __________-type main-sequence star.
G |
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D |
|
E |
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S |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
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exoskeleton |
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vertebrate |
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bone |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.