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Science Unit C Ch 4

Chapter 4 Vocabulary

troposphere The bottom layer of the Earth's atmosphere.
thermosphere The upper layer of the atmosphere where temperatures are extremely high.
mesosphere The layer of the atmosphere where air is thin and most meteors burn up.
stratosphere The layer of the atmosphere in which ozone is present.
air mass A large body of air that has the same characteristics throughout.
air pressure The weight of air pressing down on an area.
relative humidity A comparison of the actual amount of moisture in the air to the greatest possible amount that could be in the air at the same temperature and pressure.
front The border between two air masses that collide.
forecast A prediction of what the weather will be like in the future.
station model An arrangement of symbols and numbers that show the weather conditions recorded at a weather station.
surface map A map that includes station models and information about fronts and about centers of high pressure and low pressure.
weather balloon A balloon released into the atmosphere that carries a package of instruments that records data about temperature, air pressure, and humidity.
weather map A map that shows data about recent weather conditions across a large area.
thunderstorm A very strong storm with a lot of rain, thunder, and lightning.
hurricane A large, spiraling storm system that can be as much as 600 km across.
tropical storm The stage of hurricane development when the winds of a tropical depression reach a constant speed of 63 km/hr (39 mph).
tornado An intense windstorm that often forms within a severe thunderstorm.
Created by: mquay