| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Which of the following describes the Earth's mantle?
all of these |
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dense |
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hot |
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makes up most of Earth's volume |
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.
50°F is how many °C?
122 |
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10 |
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58 |
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-10 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (50 - 32)\)
\(C° = {5 \over 9} (18)\)
\(C° = {90 \over 9}\)
\(C° = 10\)
In the Periodic Table of the Elements, atomic number is equal to which of the following?
number of protons + neutrons in the nucleus |
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number of electrons orbiting the nucleus |
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number of neutrons in the nucleus |
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number of protons in the nucleus |
The Periodic Table of the Elements categorizes elements primarily by the number of protons in their nucleus (atomic number) and secondarily by the characteristics they exhibit.
Meteoroids, meteors and meteorites are categorized based on which of the following?
their density |
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their temperature |
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their size |
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their location |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
The heat from the Sun traveling to Earth is an example of which of the following?
radiation |
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electricity |
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convection |
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conduction |
Radiation occurs when electromagnetic waves transmit heat. An example is the heat from the Sun as it travels to Earth.