| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
|
day and night cycle |
|
tides |
|
the northern lights |
Tides are caused by the gravitational interaction of Earth and the Moon.
In the metric system, what prefix represents 103?
centi |
|
mega |
|
milli |
|
kilo |
Kilo is the metric system prefix for 103.
The hottest of Earth's atmospheric layers is which of the following?
troposphere |
|
thermosphere |
|
mesosphere |
|
stratosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.
Small rocks shed by asteroids and comets that reach the earth are called:
meteorites |
|
meteors |
|
shooting stars |
|
meteoroids |
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.
Blood is created in:
the heart |
|
the liver |
|
bone marrow |
|
red blood cells |
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.