| A | B |
|---|
| wind | the movement of AIR caused by differences in air pressure |
| the greater the pressuree difference | the faster the wind moves |
| differences in air pressure are caused by | UNEQUAL heating of the Earth |
| Air RISES at the | equator where air is LESS dense |
| Air SINKS at the | poles where air is MORE dense |
| air travels in large CIRCULAR patterns called | convection cells |
| convection cells are seperated by | pressure BELTS |
| pressure belts | bands of high pressure and low pressure founf every 30degrees of latitude |
| SINKING air causes HIGH PRESSure because | sinking air PRESSES down on the aire beneath it |
| pressure differences cause | air movement between the Equator and the poles |
| Coriolis Effect | apparent curving of the path of winds and ocean currents due to the Earth's rotation |
| Winds blow from | areas of HIGH pressure to areas of LOW pressure |
| WInds travelling NORTH appear to | curve East |
| winds travelling SOUTH appear to | curve West |
| GLOBAL winds | combination of convection cells every 30 degrees and The Coriolis effect |
| Global Wind SYSTEMS | polar easterlies, westerlies, trade winds |
| POLar EASTerlies | wind that blow from the EAST from the POLES to 60 degrees Latitude in BOTH hemisheres |
| WESTerlies | winds that blow from the WEST between 30 and 60 degrees latitude |
| TRADE winds | winds that blow from 30 degrees latitude to ALMOST the Equator....used by merchants to sail from Europe to America |
| trade winds of the Northern and Southern hemispheres meet in an area near the Equator called | the doldrums |
| in the doldrums there is very little | wind |
| horse latitudes | areas of high pressure at 30 degrees N and 30 degrees S latitude |
| jet stream | narrow belt of strong winds that blow in the troposhpere |
| jet streams can affect | the movement of planes and srorms |
| LOCAL wind SYSTEMS | mountain breezes and Valley breezes, SEA breezes |
| LOCAL winds are caused by | temperature changes caused by LOCAL geographic features like mountains or shorelines |
| There would be NO WIND if | the temperature of the Earth's surface were the SAME everywhere...no pressure changes |
