| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.68 |
| Score | 0% | 74% |
The number system most used in science is the:
English system |
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British system |
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metric system |
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American system |
The metric system is a number system that designates one base unit for each type of measurement. For example, the base unit for length is the meter and the base unit for mass is the gram.
Which of the following describes the Earth's outer core?
makes up most of the Earth's volume |
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solid |
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primarily solid |
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liquid |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).
__________ is caused by a lack of iron in the diet.
anemia |
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diabetes |
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shingles |
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scurvy |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.
As part of digestion, the liver produces bile which breaks down:
sugars |
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protein |
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fat |
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starches |
The liver produces bile which emulsifies (separates) fat.
The rate of vibration of sound is called:
volume |
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amplitude |
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period |
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frequency |
The rate of vibration of sound is called frequency and is measured in hertz (Hz). One hertz is one repetition per second and sounds with high frequency have a higher pitch than sounds with lower frequency. Humans can hear sounds in the range of 20 Hz to 20 kHz.