Oceans as Sources of Oxygen, Food, and Energy (Grade 10 NSC Matric Geography): Quizzes
📚Quizzes
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10 questions from this quiz
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Practise the questions
10 questions from this quiz
What proportion of Earth's oxygen is produced by phytoplankton in the oceans?
What proportion of Earth's oxygen is produced by phytoplankton in the oceans?
More than half
What are phytoplankton?
What are phytoplankton?
Microscopic algae
On scientific maps, what colour indicates phytoplankton-rich ocean areas?
On scientific maps, what colour indicates phytoplankton-rich ocean areas?
Red and orange zones
What percentage of all animal and plant life exists in the oceans?
What percentage of all animal and plant life exists in the oceans?
90%
How many tonnes of fish are caught from the world's oceans every year?
How many tonnes of fish are caught from the world's oceans every year?
More than 90 million tonnes
How much of the world's oil and gas comes from rocks beneath the continental shelf?
How much of the world's oil and gas comes from rocks beneath the continental shelf?
About half
What causes ocean tides?
What causes ocean tides?
Gravitational pull of moon and sun
What is the minimum tidal range needed for effective tidal power generation?
What is the minimum tidal range needed for effective tidal power generation?
At least five metres
What are 'sea snakes' in wave energy technology?
What are 'sea snakes' in wave energy technology?
Hinged chains of floats
Where have sea snake wave energy devices been successfully tested?
Where have sea snake wave energy devices been successfully tested?
In the Atlantic Ocean near Portugal