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ACSEE (Form 6) Water Masses — practice questions

Explore 12 free Water Masses questions in ACSEE (Form 6) Geography. Open each question or exercise to read its content, reference answers and available explanation.

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Water Masses questions and exercises with answers

Showing questions 1–12 of 12.

Worked practice questions

Ocean water movement is classified into horizontal and vertical types, which are respectively:

  1. tides or waves and ocean currents
  2. ocean currents and tides or waves
  3. salinity gradients and wind drifts
  4. wind drifts and salinity gradients
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Correct answer: B. ocean currents and tides or waves

1. Ocean water moves in two broad directions, across the surface and up or down through it. 2. Horizontal movement is the flow of water from one region to another, which is an ocean current. 3. Vertical movement raises and lowers the water column, which shows as tides and waves. 4. Naming these two classes correctly is what a good introduction to the topic rests on. 5. Salinity gradients drive some vertical movement, but they are a cause rather than a class of movement. _Source: NECTA ACSEE 2023 Geography 113/1, Question 4: Water Masses_

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The Earth's rotation deflects ocean currents to the:

  1. left in the Southern and left in the Northern hemisphere
  2. right in the Southern and right in the Northern hemisphere
  3. left in the Southern and right in the Northern hemisphere
  4. right in the Southern and left in the Northern hemisphere
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Correct answer: C. left in the Southern and right in the Northern hemisphere

1. The rotation of the Earth deflects any moving fluid, including ocean water. 2. The direction of that deflection depends on which hemisphere the flow is in. 3. In the Southern hemisphere currents are deflected to the left. 4. In the Northern hemisphere they are deflected to the right. 5. Because the two hemispheres deflect oppositely, any answer using the same direction for both must be wrong. _Source: NECTA ACSEE 2023 Geography 113/1, Question 4: Water Masses_

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High salinity in a body of ocean water leads to vertical movement because it raises the water's:

  1. density
  2. temperature
  3. transparency
  4. wave height
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Correct answer: A. density

1. Salinity measures how much dissolved salt the water carries. 2. Water holding more salt is heavier for its volume, so its density is higher. 3. Denser water sinks beneath lighter water around it. 4. That sinking, and the rising of lighter water to replace it, is vertical movement. 5. Salinity does not raise temperature; if anything the denser, saltier water tends to be the colder. _Source: NECTA ACSEE 2023 Geography 113/1, Question 4: Water Masses_

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