| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
The coldest point in the Earth's atmosphere is reached in which atmospheric layer?
troposphere |
|
mesosphere |
|
thermosphere |
|
stratosphere |
In the mesosphere, temperature again drops as altitude increases until the coldest point in the Earth's atmosphere, the mesopause, is reached where temperatures fall to −225 °F (−143 °C).
In the heart, blood flows from the right __________ to the lungs then back to the heart via the left __________.
ventricle, atrium |
|
atrium, ventricle |
|
atrium, atrium |
|
ventricle, ventricle |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.
The envelope of gases surrounding the planet is called the:
geosphere |
|
lithosphere |
|
hydrosphere |
|
atmosphere |
The biosphere is the global ecological system integrating all living beings and their relationships. This includes their interactions with the lithosphere (the rigid outer part of the earth, consisting of the crust and upper mantle), hydrosphere (all surface water), and atmosphere (the envelope of gases surrounding the planet).
Small rocks shed by asteroids and comets that reach the earth are called:
meteors |
|
shooting stars |
|
meteoroids |
|
meteorites |
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.
Saturated fats can __________ LDL ("bad") cholesterol while unsaturated fats can __________ it.
raise, decrease |
|
decrease, raise |
|
stabilize, raise |
|
decrease, stabilize |
Saturated fats can raise LDL ("bad") cholesterol while unsaturated fats can decrease it.