http://www.youtube.com/watch?v=IWjeHtdpFjE

http://www.youtube.com/watch?v=itj-x1XhzQo&feature=related

Unequal Heating Rates of land and water

Water Temperature vs. Land TemperatureLand warms (gains heat) much

faster than a body of waterLand cools (loses heat) much faster

than a body of water

This uneven heating of Earth’s surface causes wind

Water TemperatureOceans cover more than 2/3 of Earth’s surface, thus it absorbs more sunlight and stores more heat

Land TemperatureLand is made of many materials which absorb the sun’s rays differently

Differences in air temperatureWhen 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 pressureCold air has higher air pressure

Higher air pressure will flow into areas of lower air pressure which creates winds.

Local WindsSea 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 WindsLand 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 WindsThe 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

MoreDense LessDense

Cool Air Warm air

Type of Pressure

Amount of Density

Amount of Water Vapor

Less water vapor

More water vapor

Cool Air Warm air

Type of Pressure

High Pressure

Low Pressure

Amount of Density

More Dense Less Dense

Amount of Water Vapor

Less water vapor

More water vapor

Warm Cool

Cool Warm

Low pressure Highpressure

High pressure Lowpressure

Sea Breeze Land Breeze

Temperature of Air Above the Land

Temperature of Air Above the Sea

Type of Pressure Above the Land

Type of Pressure Above the Sea

Time of Day Day Night

Sea Breeze Land Breeze

Temperature of Air Above the Land Warm Cool

Temperature of Air Above the Sea Cool Warm

Type of Pressure Above the Land Low pressure High pressure

Type of Pressure Above the Sea High pressure Low pressure

Time of Day Day Night