Hydrology and Meteorology Review

Clouds form when air reaches its dew point.

• True
• False

Which of the following describes relative humidity?

• The amount of water vapor that air can hold before it begins to precipitate
• The amount of water vapor in air relative to the total amount it can contain
• The total amount of water vapor in a certain volume of air
• The temperature of the air relative to the temperature when the air is saturated with water

__________ form when water vapor condenses around particles in the air.

• Clouds
• Precipitation
• Snow
• Rain

Some early mornings, dew drops can be found on grass (or on a car parked outside), but not on other materials like sidewalks. What has happened?

• The nighttime temperature on grass and the car went below the dew point, but the concrete did not reach the dew point
• Temperatures on grass and the car were above the dew point, but the concrete was cooler than the dew point all night
• The relative humidity of the air above the grass and car was higher than it was over the concrete
• None of these

Humidity is the amount of water vapor in the air in a particular spot. 

• True
• The amount of water vapor in air relative to the total amount it can contain
• The total amount of water vapor in a certain volume of air
• The temperature of the air relative to the temperature when the air is saturated with water

How do clouds have an influence on weather?

• Prevents solar radiation from reaching the ground
• Absorbs warmth emitted from the ground
• A source of precipitation
• All of these

Stratus clouds that produce precipitation are called ________.

• cirrostratus
• nimbostratus
• altostratus

During the day clouds block the sun and keep the surface cooler; at night they contain the heat radiating off the ground and make the atmosphere warmer.

• True
• False

Weather is the long-term average of the measured humidity in a particular spot. 

• True
• False

Weather is more predictable than climate.

• True
• False