Multiple choice

Tides in the oceans and seas are caused by ______.

  1. daily motion of the earth

  2. annual motion of the earth

  3. gravitational attraction of the moon

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ocean tides are primarily caused by the gravitational pull of the moon on Earth's oceans. The moon's gravity creates a bulge in ocean water on the side facing it. The sun also contributes but has less effect due to greater distance. Earth's daily motion affects tides but doesn't cause them.

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