| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.18 |
| Score | 0% | 64% |
Meteoroids, meteors and meteorites are categorized based on which of the following?
their size |
|
their density |
|
their temperature |
|
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.
__________ is caused by a lack of iron in the diet.
anemia |
|
shingles |
|
scurvy |
|
diabetes |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.
Which of the following does not represent the freezing point of water?
32°F |
|
0°C |
|
273K |
|
0°F |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
Which of the following is not one of the outer planets?
Uranus |
|
Jupiter |
|
Neptune |
|
Venus |
In contrast to the solid terrestrial planets, the outer planets (Jupiter, Saturn, Uranus, and Neptune) consist of hydrogen and helium gas and water.
Which of the following is not true of light waves?
travel faster than sound waves |
|
are mechanical waves |
|
can travel through a vacuum |
|
are electromagnetic waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.