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DIDAVISION


WHAT IS THE SEA LIKE?


WHAT IS THE SEA LIKE?
WHAT IS THE SEA LIKE?

Surface area occupied by seas. The depths. Marine plants. Characteristics of sea-water. Ocean currents. The temperature of sea-water affects continental climates and their coast-lines. Wave and tide formation. Tsunamis, waves of gigantic proportions. The sea bed. Underwater gas and petroleum deposits. Summary.


INTRODUCTION
- Seas contain 97% of the planetís water and this affects the climate and the temperature of entire continents.
- Life began in the sea

SEA-WATER
- Each year, some 128,000 cubic kilometres of water evaporate. However, the salts contained in the sea waters, do not evaporate.
- More thatn 70% of all chemical elements known in Nature are present in the sea-water. The common salt.
- The sea water is a vital element for life and evolution of the multitude of plants and animals that exist on our planet.

THE OCEAN CURRENTS
- The seas contain 524 millions of cubic kilometres of water.
- The sea is never really immobile.
- The factors that influence the sea movements are: the influence of the Moon, the temperature, the different densities of water and the force of the wind
- The deep marine currents are very important for sea-life.
- Thermal quality of the water

WAVES AND TIDES
- What are waves and tides?
- Tsunamis
- Spring tides

THE SEA-BED
- The biggest mountain range in the world is at the bottom of the Atlantic Ocean
- The continental platform
- Deposits of gas and petroleum
- The continental slope. The abyss zone.

SUMMARY

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