Multiple choice

Consider the following factors:

  1. Rotation of the earth
  2. Air pressure and wind
  3. Ocean water density
  4. Revolution of the earth Which of these factors modify ocean currents?

  1. 1 and 2

  2. 1, 2 and 3

  3. 1 and 4

  4. 2, 3 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ocean currents are modified by multiple factors: Earth's rotation causes the Coriolis effect which deflects moving water (factor 1). Air pressure and wind systems drive surface currents through wind stress (factor 2). Ocean water density differences (due to temperature and salinity variations) drive thermohaline circulation and deep water formation (factor 3). Revolution of the earth (factor 4) affects seasonal patterns but is not a direct modifier of current flow. Therefore, factors 1, 2 and 3 directly modify ocean currents.

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