What is wind?
What causes wind?
Winds are caused by differences s in air pressure. Wind is the sideways movement of air and is moved from an area of high pressure to an area of low pressure.
Sea Breeze vs. Land Breeze
What are local winds?
Local winds are winds that blow over a short distance.
How are local winds created?
Local winds are created by the unequal heating of Earth's surface within a small area.
- Unequal heating often happens near lakes and ocean coasts
- A example of local wind is a cool breeze blowing in from the water over a beach
- Caused by geographic features that produce temperature differences
How do sea breezes blow?
A sea breeze blows from the ocean.
- A lake breeze is a local wind that blows from a lake
- A sea breeze or a lake breeze usually happens during the day
- The wind blows from the higher pressure over the water to lower pressure over the land
The sea breeze strength will vary depending on the temperature difference between the land and the ocean
What are global winds?
A global wind is a wind that blows steadily over a long distance.
- Global winds blows from the same direction every time
- These are polar easterlies, prevailing westerlies, and trade winds.
How are global winds created?
- The combination of pressure belts and the Coriolis Effect cause global winds
- All wind is caused by the uneven heating of Earth's surface, which sets convection currents in motion
- Convection currents on a large scale cause global winds; convection currents on a small scale cause local winds.