Wind and Waves

620 Words3 Pages
WIND:  Winds are caused by differences in air pressure.  They move from areas of high pressure to low pressure.  Differences in air pressure are caused by unequal heating of the atmosphere.  Cool air has higher air pressure so it flows underneath the warm, less dense air.  Winds that blow over short distances and are caused by unequal heating of Earth’s surface within a small area. Waves  Waves start in the open ocean  The size of a wave depends on the strength of the wind, the length of time that it blows, and the distance over which it blows  Waves move energy, not water. The water in a wave does not actually move forward, just the energy generated by the wind.  The wind affects the water at the…show more content…
(Page 384)  The cold, saltier water sinks and starts moving back towards the equator along the bottom of the ocean.  When the water reaches the equator, it warms and rises again.  Deep currents flow slowly. They may take as long as 1,000 years to flow from pole to equator and back again. TIDES:  Tides are the daily rise and fall of Earth's waters on its coastlines  When water on the coast reaches its highest point it is high tide.  When water on the coast reaches its lowest point it is low tide.  Unlike surface waves, tides are regular and do not depend on wind. If not wind, then what causes tides?  Tides are caused by the interaction between the Earth, the moon, and the sun.  The gravity exerted on Earth's oceans by the moon and the sun cause the water to move from one side of the planet to the other side.  The moon is much closer to the Earth than the sun, so it exerts a greater gravitational effect on the tides.  There are two high tides and two low tides about every 25 hours.  That means every six or so hours you have a high tide and then a bit  more than six hours later you have a low tide.  Changes in the positions of Earth, the moon, and the sun affect the  heights of tides during a
Open Document