Clouds
The basic cause of all weather is the ______.
Falling ice crystals melt, hit the earth as liquid rain, BUT refreeze as soon as they land.
Freezing rain
Air is saturated when the humidity of the air is _______ percent.
100
If a tornado has been spotted, meteorologists issue a tornado ________.
warning
Wispy, curly clouds very high in the atmosphere belong to the ________ family.
Cirrus
The air that we live in receives most of its warmth from the ______.
ground
An ice crystal in a cloud becomes too heavy, falls, melts, and lands on the earth as liquid water.
Rain
Water vapor that condenses and forms frozen water on the ground is called _________.
Frost
The calm region of very low air pressure in the center of a tornado is called the ______.
eye
A term used to describe a cloud from which rain is falling is ________.
Nimbus
Different seasons are caused by the _______ of the earth's axis.
Tilt
Falling ice crystals melt into raindrops, then refreeze and land on earth as tiny pieces of ice.
Sleet
The lowest possible temperature at which air is able to hold all of its water vapor is its ____ ____?
dew point
The thin channel of charged air through which a lightning bolt can travel is the _________.
Step Leader
Sheets of clouds that often produce rain are _______ clouds.
Warm air is ___________ than cool air.
Lighter
Falling ice crystals melt slightly, stick, and freeze together into snowflakes.
wet snow
The process in which water vapor leaves the air and changes into liquid water is called ________.
Condensation
The broad, flat top of a cumulonimbus cloud is called an _______ top.
anvil
Clouds made of very small ice crystals are _____ clouds.
Cirrus
Winds are produced by __________ differences on the earth.
temperature
A small piece of ice is tossed up and down inside a cloud, forming several layers of ice, until it is too heavy and falls to earth.
hail
The amount of water vapor that the air can hold at a given temperature is the ____ _____ of the air.
Relative humidity
The row of thunderheads that builds up in the front of advancing cold air is called a _______ ______.
squall line