5.2.14 Today's Subject: Oceans
Oceans provide about 30% of our protein. It’s salty. It’s saltwater.You can’t drink it.The ocean is about ~70 % of the Earth’s surface.There are many currents.There are many types of plants and animals.It’s always moving. Sometimes, sewage and garbage is dumped into the ocean.
- Southern (Antarctic)
The way water moves:
- Water heats up at the equator and stays on the surface. It flows to cooler regions.
- Water cools at the poles and sinks (because cool water is denser) and flows to warmer regions.
2) Global Winds
Winds are the main source of movement for surface ocean currents. Wind passing over ocean, through friction, causes the ocean to move.
- The Earth spins on its axis. Fluids (the atmosphere and the oceans) will be deflected by its spin.
- Currents in the northern hemisphere tend to move clockwise.
- Currents in the Southern Hemisphere tend to move counterclockwise.
4) Surface Currents
Video of NASA: Perpetual Ocean
- North Atlantic, clockwise
- South Atlantic, counterclockwise
- Indian, counterclockwise
- North Pacific, clockwise
- South Pacific, counterclockwise
- Antarctic Circumpolar, clockwise