| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
The __________ is a system of muscles that allows breathing.
diaphragm |
|
pulmonary |
|
trachea |
|
bronchioles |
The diaphragm is a system of muscles that allows breathing. During inhalation, the diaphragm expands and air rushes in to fill the space created. Then, during exhalation, the diaphragm contracts and forces the air back out.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
large intestine |
|
mouth |
|
small intestine |
|
stomach |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
Which of the following is not one of the outer planets?
Uranus |
|
Neptune |
|
Jupiter |
|
Venus |
In contrast to the solid terrestrial planets, the outer planets (Jupiter, Saturn, Uranus, and Neptune) consist of hydrogen and helium gas and water.
In the water cycle, infiltration is most closely related to:
rivers |
|
runoff |
|
water table |
|
oceans |
The water then accumulates as runoff and eventually returns to bodies of water or is absorbed into the Earth (infiltration) and becomes part of the water table, an underground resevoir of fresh water.
The hottest of Earth's atmospheric layers is which of the following?
thermosphere |
|
mesosphere |
|
stratosphere |
|
troposphere |
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.