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Mrs. Sweeton 4th Grade Science teacher Chickamauga Elementary 707-382-3100 ext:1052 Chapter 3 vocabulary Air mass: A large body of air that ha about the same temperature, air pressure and moisture through out Air pressure: The weight of air as it presses down on Earth’s surface Atmosphere: The layers of air that surround Earth’s surface Climate: The average weather condition in an area over a lone period of time Condensation: The change of the state of gas to a liquid Evaporation: The change of state from a liquid to a gas Front: the place where two air masses meet Polar climate: Places with polar climate have a very cold temperatures throughout the year, they are located near the North and South Poles Precipitation: Any form of water that falls from the sky to Earth’s surface i.e. Rain sleet snow hail Temperate climate: Place with a this climate usually have warm dry summers and cold, wet winters Tropical climate: A climate that is hot and rainy most of the year, it is close to the equator Water cycle: The movement of water into the air as water vapor and back to Earth’s surface as precipitation Weather: The condition of the atmosphere at a certain time and place Greenhouse effect: The process by which heat from the sun builds up near the surface of the Earth and is trapped there by the atmosphere