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Things we already know • Wind is what state of matter? • Convection currents occur in __________ or ____________ Other things we know - Cold air is more dense than warm air - As air is warmed it rises Things are heated at different rates by the sun! The basics of wind • View the website http://www.windpower.org/en/kids/choose/ wind/index.htm • Read for information : Pages 536-540 in your textbook and fill in your notes sheet with your elbow buddy • Winds are caused by differences in air pressure • Differences in air pressure are caused by unequal heating of the atmosphere • Air over a heated surface becomes less dense and rises, cool dense air falls and causes wind • Wind directions is measured using a wind vane • Wind speed is measured using an anemometer • Wind-chill factor is caused because wind removes heat as it blows over your body • Local winds blow over short distances • Caused by unequal heating within small areas, near mountains or water • Sea breeze- when the wind blows from an ocean or lake towards the land; happens in the day when the land warms faster than the water • Land breeze- happens at night when the land cools more quickly than the water; wind blows from the land to the water