Chapter 16-1
Study Guide
Answers
Number 1
• Water gets from Earth’s surface into the air by
the process of evaporation.
Number 2
• Clouds form from the process of
condensation.
Number 3
• Rain is the most common form of
precipitation.
Number 4
• Runoff carries water from precipitation into
the oceans.
Number 5
• Relative humidity is a percentage that shows
how much water vapor is in the air compared
to how much the air can actually hold at a
certain temperature.
Number 6
• A psychrometer is used to measure the
relative humidity of the air.
Number 7
• Humidity is the amount of water vapor in the
air.
Number 8
• Saturated air has a relative humidity of 100%.
It is holding all the water vapor that it can at a
certain temperature.
Number 9
• Air can become saturated when water vapor is
added to the air through evaporation or when
air cools to its dew point.
Number 10
• Dew point is the temperature at which gas
condenses into a liquid.
Number 11
• The air’s ability to hold water vapor will
increase if the air’s temperature increases.
Number 12
• Clouds are made of millions of tiny water
droplets or ice crystals.
Number 13
• Cumulus clouds bring fair weather. No rain.
Number 14
• Cumulonimbus clouds bring thunderstorms.
Number 15
• Nimbostratus clouds bring light to heavy
continuous rain.
Number 16
• An altocumulus cloud is a puffy mid-level
cloud that indicates fair weather.
Number 17
• A cirrostratus cloud is layered and is made of
ice crystals. Found at high altitudes.
Number 18
• Cumulonimbus clouds are found from low to
high altitudes. Very large clouds.
Number 19
• Stratus clouds form in layers. They can cover
large areas of the sky and block out the sun.
Number 20
• Fog is a stratus cloud that has formed on the
ground.
Number 21
• Sleet starts as rain and freezes in the air.
• Snow forms when water vapor changes
directly to a solid.
Number 22
• Hail is balls or lumps of ice that fall from
cumulonimbus clouds.
• Hail forms when updrafts of air in a
cumulonimbus clouds carries raindrops high I
the clouds, the raindrops freeze and hail
forms.