Oceans as Sources of Oxygen, Food, and Energy (Grade 10 NSC Matric Geography): Flashcards
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Phytoplankton definition
Phytoplankton definition
Microscopic algae that perform photosynthesis in ocean waters
% of Earth's oxygen from phytoplankton
% of Earth's oxygen from phytoplankton
More than half
Map colour of phytoplankton-rich ocean areas
Map colour of phytoplankton-rich ocean areas
Red and orange zones
% of all animal & plant life in oceans
% of all animal & plant life in oceans
90%
Annual fish catch from oceans (tonnes)
Annual fish catch from oceans (tonnes)
More than 90 million tonnes
Continental shelf definition
Continental shelf definition
Underwater continental crust area extending from coastline
% of world's oil/gas from continental shelf
% of world's oil/gas from continental shelf
About half
Cause of tides
Cause of tides
Gravitational pull of moon & sun + Earth's rotation
Minimum tidal range for effective tidal power
Minimum tidal range for effective tidal power
At least 5 metres
Wave energy 'sea snakes'
Wave energy 'sea snakes'
Hinged chains of floats that bob up & down with waves