Sea Facts



  • Recent evidence from microfossils suggests that the Mediterranean was never completely dry.
  • Warm seas such as the Mediterranean lose much more water by evaporation than they gain from rivers. So a current of water flows in steadily from the ocean.
  • Seas are small oceans, completely enclosed or partly enclosed by land.
  • Seas are shallower than oceans and have do not have any major currents flowing through them.
  • In the Mediterranean and other seas, tides can set up a seiche — a standing wave that sloshes back and forth like a ripple running up and down a bath.
  • If the wave cycle of a seiche is different from the ocean tides, the tides are canceled.
  • If the natural wave cycle of a seiche is similar to ocean tides, the tides are magnified.
  • Scientists thought that the Mediterranean was a dry desert 6 million years ago. They believed it was 3000 m lower than it is today, and covered in salts.
  • Warm seas lose so much water by evaporation that they are usually much saltier than the open ocean.
  • Waves in enclosed seas tend to be much smaller than those in the open ocean, because there is less space for them to develop.
  • The Dead Sea is the lowest sea on Earth, 400 m below sea level.
  • The warm waters of the Mediterranean attract tourists to the coast of Spain.