Here are the answers for the Section 4 review:
1. What instrument is used to measure relative humidity? How does it work?
Relative humidity is measured with a psychrometer. It has two thermometers, called a wet bulb and a dry bulb and a moist cloth. If there is a lot of evaporation, the wet bulb drops lower than the dry bulb. A lot of humidity causes the wet bulb to not change as much, but if the relative humidity is low, the wet bulb will drop along with the amount of water.
2. What conditions are needed for clouds to form?
Conditions needed for clouds to form is water vapor in the air so that it can turn into water or ice crystals.
3. Describe each of the three main types of clouds.
The three main types of clouds are the cirrus, cumulus, an stratus clouds. Cumulus clouds look like big cotton balls: Big and puffy. They bring fair weather. But some of those clouds can have flat tops (cumulonimbus clouds) and they mean thunderstorms are to come. Stratus clouds look that flat layers that covers the whole sky. If they get thick, it can drizzle, snow, or rain (nimbostratus). Cirrus clouds are feathery and form when it is cold so they are made o ice crystals.
4. Classify each of the following cloud types as low-level, medium level, or high level:
altocumulus high-level
altostratus medium-level
cirrostratus high- level
cirrus high- level
cumulus low- level
fog low-level
nimbostratus low- level
stratus low- level
