| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.90 |
| Score | 0% | 58% |
Meteoroids, meteors and meteorites are categorized based on which of the following?
their temperature |
|
their size |
|
their density |
|
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.
When two air masses meet and neither is displaced, what kind of front is present?
cold |
|
warm |
|
stationary |
|
occluded |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
__________ and __________ pair to strengthen bones.
vitamin D, calcium |
|
vitamin D, magnesium |
|
iron, calcium |
|
calcium, vitamin A |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
protons |
|
electron shells |
|
atomic mass units |
|
electrons |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
What part of the nervous system controls simple reflexes?
medulla |
|
cerebrum |
|
spinal cord |
|
autonomic |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.