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The Movement of Ocean Water
Transcript of The Movement of Ocean Water
To : Miss Kurtz's 7th Grade Students
From: Miss Kurtz
Subject: Movement of the Oceans
designed by Péter Puklus for Prezi
The Big Idea
Those currents are driven by differences in density and by wind.
1. Global Winds
2. Coriolis Effect
This is the Earth's rotation causing wind and surface currents to move in curved paths
Remember: This happens with currents in the atmosphere, too!
Ocean currents- streamlike movements of water
Ocean currents are split into two categories:
Horizontal, streamlike movements of water that occur at or near the surface of the ocean.
Can reach depths of several hundred meters, and can be several thousand kilometers long.
Controlled by 3 factors: global winds, coriolis effect, and continental deflections
Temperature also affect currents.
Warm water currents- begin at equator, carry warm water away.
Cold water currents- begin near poles, carry cool water away.
All the oceans are connected and both warm and cold currents travel from one ocean to another.
Streamlike movements of water located far below the surface.
*Picture trying to cool off hot chocolate*
Different winds cause currents to flow in different directions.
Near the equator, winds blow east to west. Closer to the poles, winds blow west to east.
Fancy way of saying:
When currents meet continents, the currents must deflect, or change direction.
Not controlled by wind, but instead controlled by density.
The amount of matter in a given space.
Affected by temperature and salinity.
A measure of the amount of dissolved salts or solids in a liquid.
Water with a high salinity
will be more dense.
As water's temperature decreases and salinity increases, the water becomes denser and sinks. That cold water moves along the ocean floor. Deep currents move and mix water around the world and they carry cold water from the poles to the equator.
Formation of Currents
Surface currents are streamlike movements of water at or near the surface of the ocean.
Surface currents are controlled by: global winds,the Coriolis effect, and continental deflections.
Deep currents are streamlike movements of water located far below the surface.
Deep currents form where the density of ocean water increases. Water density depends on temperature and salinity.
One day, people strolling along a beach in Washington saw an amazing sight. Hundreds of shoes of all colors and sizes were washing ashore from the Pacific Ocean. This sneaker spill was traced to a cargo ship accident where containers of shoes fell overboard. But- the most amazing part of this is that scientists could predict where the sneakers would wash up next. Just as the scientists predicted, they washed up in Oregon and Hawaii. How did scientists know this? Currents! Unlike waves, currents carry water from one place to another in a predictable pattern.
Some currents move water at the surface of the ocean, while other currents move water deep in the ocean.