| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.15 |
| Score | 0% | 63% |
In the heart, the __________ artery and vein manage blood flow to the lungs.
atrial |
|
pulmonary |
|
capillary |
|
aorta |
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.
Absolute zero is which of the following?
the freezing point of hydrogen |
|
0°C |
|
the coldest temperature possible in the universe |
|
the freezing point of oxygen |
In contrast to the Celsius scale (measured in degrees centigrade) that fixes 0° at the freezing point of water and the Fahrenheit scale that uses 32°, the Kelvin scale fixes 0 at absolute zero (-273°C) which is the lowest temperature possible in the universe.
The first step in the water cycle is:
reclamation |
|
infiltration |
|
evaporation |
|
precipitation |
The water (hydrologic) cycle describes the movement of water from Earth through the atmosphere and back to Earth. The cycle starts when water evaporates into a gas from bodies of water like rivers, lakes and oceans or transpirates from the leaves of plants.
The gravitational interaction of Earth and the Moon is responsible for which of these?
day and night cycle |
|
seasons |
|
tides |
|
the northern lights |
Tides are caused by the gravitational interaction of Earth and the Moon.
Which of the following temperatures is least like the others?
32°F |
|
absolute zero |
|
0K |
|
-273°C |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.