6With less energy to heat the poles, than the equator, the temperature is lower at the poles. More solar radiation at the equator than at the poles converts into higher temperatures at the equator.
7Thus, more solar radiation at the equator means: 1. Air above the equator is hotter.2. The air is less dense.3. Therefore, the air moves upward.4. As this air moves up it is replaced by cooler air.5. Thus you have convection currents.
9Where does this cooler air come from? From the N and S poles silly!Duh!Remember Santa doesn’t wear that full length Santa suit because he’s trying to get a tan.
10Ho… ho…ho… and what would you like for Christmas Ho… ho…ho… and what would you like for Christmas? A stocking full of coal? Ho…ho…ho.
11The Four SeasonsThe reason there are seasons on Earth is because of the tilt of the Earth. This tilt is 23 ½ degrees. When the northern hemisphere is tilted away from the sun you have the winter and when it is tilted towards the sun you have summer.
12N hemisphere away from sun WinterS hemisphere towards the sun
13N hemisphere towards the sun, summer S hemisphere away from the sun, winter
14So… the reason there are seasons is because of the tilt of the Earth So… the reason there are seasons is because of the tilt of the Earth. This is a quiz, benchmark and district final question. Now you know the answer.
15The Coriolis Effect1. The coriolis effect causes air and water to move to the right in the northern hemisphere and2. to move to the left in the southern hemisphere.3. This effect causes distinct water and wind patterns.
16The Coriolis EffectIn a nut shell, the Coriolis effect is the movement of atmospheric air and ocean waters due to the rotation of the Earth on it’s axis.
17The Surface Winds1. Between 0 and 30 degrees N and S latitude are the trade winds, while2. between 30 and 60 degrees N and S latitude are the westerlies.
26High Altitude Winds1. High altitude winds or jet streams are narrow belts of wind which can blow from 97 to 185 km/hr.2. Airplane pilots use these winds to move around the world.3. Change from day to day and season to season.
29Daily and Seasonal Winds 1. A convection current is when a large body of water meets a large land mass which can result in convection currents.2. Solar radiation warms the land faster than the water so the air over the land moves upward being replaced by the air over the water.
30Sea and Land Breezes1. When the air moves from the land to the sea it is called a land breeze.2. When the air moves from the sea to the land it is called a sea breeze.
34Quick Quiz1. The __________ are responsible for the movement of much of the weather across the United States.a. prevailing westerliesb. polar easterliesc. trade windsd. doldrums
352. The deflection of wind, or Coriolis effect, from the north and south poles is due to a. Rotation of the Earthb. The shape of the Earthc. The tilt of the Earth on it’s axisd. The total land mass in North America.
363. Temperature differences on Earth are caused by ___________. a. the rotation of the sunb. the closeness of the sun to the Earthc. the tilt of the Earth on it’s axisd. the distance to the sun during the summer.
374. Air above the equator is heated more than at other places on Earth because the sun’s rays strike Earth _________ at the equator.a. at a low angleb. at a tiltc. directlyd. at a 45 degree angle
385. When the land is heated faster than the ocean the result is a a. land breezeb. sea breezec. directional breezed. none of the above