This type of cloud is thin, wispy, and made of ice crystals

• cumulus cloud
• stratus cloud
• cirrus cloud
• cumulonimbus cloud

The temperature at which water vapor condenses is the 

• relative humidity
• humidity
• freezing point
• dew point

What are the four classes of clouds based on altitude?

• cirrus, nimbus, stratus, cumulus
• low, middle, high, vertically developed
•  troposphere, stratosphere, mesosphere , thermosphere
• classes of clouds are not based on altitude

Which of these is NOT a way in which clouds affect climate?

• clouds cool Earth's surface
• clouds warm Earth's surface
• clouds deliver precipitation
• clouds block all harmful radiation

This type of cloud is thin and flat, and the edges are not clearly defined

• cirrus cloud
• cumulus cloud
• stratus cloud
• cumulonimbus cloud

This type of cloud is thick and puffy on top, and generally flat on the bottom. It has well-defined edges and can change shape rapidly.

• cumulus cloud
• stratus cloud
• cirrus cloud
• cloud 9

Why doesn't cloud formation take place until the dew-point temperature is reached?

• because dew-point is the temperature at which water vapor condenses into water droplets
• cloud formation can take place at any temperature, and does not depend on the dew-point temerature
• because water sublimates at the dew-point temperature
• the dew-point temperature only applies on Earth's surface, not in the atmosphere

Nimbostratus and cumulonimbus clouds can signal what type of upcoming weather?

• fair skies
• hot, sunny weather
• windy weather
• rainy weather

Cumulus and cirrus clouds can signal what type of upcoming weather?

• fair skies
• hot, sunny weather
• windy weather
• rainy weather

Which of the following is an example of a cloud of vertical development?

• nimbostratus cloud
• cumulonimbus cloud
• cirrus cloud
• stratus cloud