Which of the following causes tides?
  1. The moon’s gravitational pull on the earth’s surface
  2. The earth’s gravitational pull on the moon’s surface
  3. Wind
  4. Sea life
Explanation
Answer: A - The moon’s gravitational pull on the earth’s surface causes tides. Tides can occur daily, up to two times per day for high tide and two times per day for low tide, depending on the location on the earth and other factors. High tide is when water levels are at their highest and low tide is when water levels are at their lowest.
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