air masses - large pockets of air with the same temperature and moisture content, weather front - the spot where two air masses meet, tropical air mass - warm air masses found near the equator, continental air mass - dry air mass found over land, maritime air mass - air mass found over the ocean , weather - temporary conditions in the atmosphere , climate - average weather conditions over a long period of time, stationary front - formed when a warm air mass and a cold air mass collide and neither has enough force to move the other out of the way, occluded front  - formed when a warm air mass is caught between two cold air masses/ eventually the two air masses come together and push the warm air mass up and out of the way  , cold front  - formed when a cold air mass and warm air mass collide and the warm air mass is pushed up and out of the way ( brings cold and stormy weather), warm front  - formed when a warm air mass catches up to and replaces a cold air mass (brings light rain and then warmer weather), thunder - the sound produced as lightning is moving through the air , lightning - formed from the electrical charges produced in the clouds , cyclone - formed when the low pressure is surrounded by high pressure air / the low pressure air rises / can produce clouds and rain, anticyclone - formed when the high pressure air is surrounded by low pressure air/ the high pressure air sinks/ it produces dry and clear weather , tornado - formed when a funnel cloud touches the ground , hurricane - formed in low latitude areas where the water is warm enough to create the heavy rain and very powerful winds, latitude - the distance north or south of the equator, altitude or elevation - the height above sea level, rain shadow effect - when two very different climates form on opposite sides of the mountain ,

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