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Water Temperature vs. Land Temperature Land warms (gains heat) much faster than a body of water Land cools (loses heat) much faster than a body of water This uneven heating of Earth’s surface causes wind

Water Temperature Oceans cover more than 2/3 of Earth’s surface, thus it absorbs more sunlight and stores more heat Land Temperature Land is made of many materials which absorb the sun’s rays differently

Differences in air temperature When you have differences in air temperature, hot air will rise (it’s less dense) and cold air will sink (it’s more dense). Hotter air has lower air pressure Cold air has higher air pressure Higher air pressure will flow into areas of lower air pressure which creates winds.

Local Winds Sea Breeze- Happens during the day. Cool air above the ocean or sea moves towards the warm air above the land. The cool air above the ocean has a higher pressure and the warm air above the land has a lower pressure. Air always move from an area of high pressure to low pressure, creating the wind.

Local Winds Land Breeze- Happens during the night. Cool air from the land moves towards the warm air above the ocean. The cool air above the land has a higher pressure and the warm air above the ocean has a lower pressure. Air always move from an area of high pressure to low pressure, creating the wind.

Global Winds The sun’s rays does not hit the surface of the Earth equally. The Equator receives more direct rays, therefore it is warmer. The poles receive indirect rays, therefore it’s colder. The Poles have colder air and high pressure. The equator has warmer air and low pressure. The air moves from the high pressure area to the low pressure creating global winds. The movement of the winds around the globe is called: GLOBAL CONVECTION CURRENTS

LowPressureHigh Pressure MoreDenseLessDense Cool AirWarm air Type of Pressure Amount of Density Amount of Water Vapor Less water vapor More water vapor

Cool AirWarm air Type of Pressure High PressureLow Pressure Amount of Density More DenseLess Dense Amount of Water Vapor Less water vapor More water vapor

WarmCool Warm Low pressureHighpressure High pressureLowpressure Sea BreezeLand Breeze Temperatureof Air Above the Land Temperatureof Air Above the Sea Type of Pressure Abovethe Land Type of Pressure Abovethe Sea Timeof Day DayNight

Sea BreezeLand Breeze Temperature of Air Above the Land WarmCool Temperature of Air Above the Sea CoolWarm Type of Pressure Above the Land Low pressureHigh pressure Type of Pressure Above the Sea High pressureLow pressure Time of Day DayNight