Download Chapter 6: Water Cycle and Weather

Chapter 6: Water Cycle and Weather Name___________________________________
Lesson 3: What are air masses?
Air masses
1. Which statement is true about an air mass?
a. Air masses from the north bring warmer weather than those from the south.
b. Air masses forming over land are more humid than those forming over water.
c. Air masses forming in the polar areas are warm or hot.
d. Air masses are huge bodies of air with nearly the same temperature and humidity.
2. The amount of water vapor in the air is called
a.
b.
c.
d.
Air mass
Humidity
Cold front
Warm front
Cold Front
3. The area where the two masses meet is called
a. a front
b. humidity
c. air masses
d. density
4. What happens when a cold air mass bumps into a slow-moving warm air mass?
a. The different air masses mix.
b. A warm front forms.
c. A cold front forms.
d. The warm air mass sinks underneath the cold air mass.
Cold and Warm Fronts(look in both sections)
5. What is one difference between a cold front and a warm front?
a. Warm fronts usually bring steady, longer-lasting precipitation.
b. Cold fronts usually move more slowly than warm fronts.
c. Cold fronts spread out more and affect weather over a larger area.
d. Clouds form along a warm front but not along a cold front.
Refer to your Cold front and Warm front sections on the Weebly.(Look for key words.)
a.
Cold front
b. Warm front
1._____Forms when cold air runs into warm air that’s moving or standing still
2._____Snow and rain may last longer
3._____Slides over the cold air because warm air is less dense
4._____Leaves behind warmer temperatures
5._____Forms when warm air hits cold air that’s moving slowly
6._____Slides underneath the warm air because cold air is dense, thicker, than warm air
7._____Causes strong winds and thunderstorms
8._____Since the air spreads out, it affects a larger area
9._____Moves quickly and leaves skies clear with cooler temperatures
10._____Moves slowly and leaves warmer temperatures
Clouds
Place the correct letter next to the description. Refer to the Cloud section on the Weebly.
A. Cumulus
B. Cirrus
C. nimbo
D. alto
E. Stratus
F. Cumulonimbus
1._____form near the Earth’s surface
2._____form high in the atmosphere when water vapor turns into tiny ice crystals
3._____add to the name if the clouds are very high
4._____add to the name if they are rain-bearing
5._____flat layers
6._____some called “mares’ tails”
7._____thick, puffy, white clouds
8._____featherlike
9._____darker cumulus clouds that may bring thunderstorms
10._____appear during fair and good weather