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CBSE Class 9 Oceans and Life — practice questions — page 2

Explore 98 free Oceans and Life questions in CBSE Class 9 Social Science. Open each question or exercise to read its content, reference answers and available explanation.

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Oceans and Life questions and exercises with answers

Showing questions 31–60 of 98.

How far below the surrounding ocean floor do trenches typically lie?Read the answer and worked solution →Most oceanic trenches are found around which ocean?Read the answer and worked solution →About how many kilometres of oceanic trenches exist worldwide?Read the answer and worked solution →Trenches mark the locations of which kind of tectonic boundary?Read the answer and worked solution →Which features form when fluid rises at an ocean trench?Read the answer and worked solution →What is a continental shelf?Read the answer and worked solution →Roughly at what depth does the continental shelf usually end?Read the answer and worked solution →What is the average angle of the continental slope?Read the answer and worked solution →What are steep valleys cut into the continental slope called?Read the answer and worked solution →Under UNCLOS, how is the continental shelf defined legally?Read the answer and worked solution →Why were many continental shelves once exposed as land?Read the answer and worked solution →Which gentle zone sits between the slope and the abyssal plain?Read the answer and worked solution →How far from the coast does the territorial sea end?Read the answer and worked solution →How far out can an exclusive economic zone extend from the coast?Read the answer and worked solution →What rights does a coastal state hold in its exclusive economic zone?Read the answer and worked solution →In which year was the convention that prescribes the EEZ adopted?Read the answer and worked solution →When do two countries' exclusive economic zones overlap?Read the answer and worked solution →How far can the extended continental shelf extend?Read the answer and worked solution →What does the term blue economy refer to?Read the answer and worked solution →According to the World Bank, what is the blue economy about?Read the answer and worked solution →Which activity is counted as part of the blue economy?Read the answer and worked solution →Which unit measures ocean current flow?Read the answer and worked solution →What are the two basic types of ocean currents?Read the answer and worked solution →What is the deepest place on Earth?Read the answer and worked solution →Which hidden underwater feature is the world's longest mountain range?Read the answer and worked solution →What is the submerged, shallow edge of a continent called?Read the answer and worked solution →Which submarine feature marks the steep true edge of a continent?Read the answer and worked solution →What is the vast, flat and deep part of the ocean floor called?Read the answer and worked solution →Which parts of the ocean floor are the deepest?Read the answer and worked solution →An underwater mountain of volcanic origin that never reaches the sea surface is aRead the answer and worked solution →

Worked practice questions

How far below the surrounding ocean floor do trenches typically lie?

  1. About 300 to 400 metres
  2. About 30 to 40 kilometres
  3. About 3 to 4 kilometres
  4. About 30 to 40 metres
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Correct answer: C. About 3 to 4 kilometres

Trenches typically sit 3 to 4 km below the surrounding ocean floor.

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Most oceanic trenches are found around which ocean?

  1. Atlantic Ocean
  2. Arctic Ocean
  3. Southern Ocean
  4. Pacific Ocean
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Correct answer: D. Pacific Ocean

Most trenches lie along plate boundaries around the Pacific Ocean.

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About how many kilometres of oceanic trenches exist worldwide?

  1. About 50,000 km
  2. About 5,000 km
  3. About 10,000 km
  4. About 500,000 km
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Correct answer: A. About 50,000 km

Trenches add up to roughly 50,000 km around the globe.

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