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ASVAB · Earth and Space Science

What causes the tides in Earth's oceans?

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Correct answer

The gravitational pull of the Moon (and Sun)

  1. A Ocean currents only
  2. B Wind only
  3. C The gravitational pull of the Moon (and Sun)
  4. D Earth's rotation only

Why this is the answer

TIDES are caused primarily by the GRAVITATIONAL PULL of the MOON (and to a lesser extent the Sun) on Earth's oceans. ASVAB General Science includes earth science/astronomy. The Moon's gravity pulls ocean water toward it, creating high tides; there are generally two high and two low tides per day. SPRING TIDES (higher) occur when the Sun and Moon align; NEAP TIDES (lower) when they're at right angles. The Moon's gravitational influence on tides is a commonly tested concept.
Source: ASVAB General Science — Earth Science, Tides

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About this topic: Earth and Space Science

Earth and space science covers geology (rock types, plate tectonics), weather and the atmosphere, the water cycle, and astronomy — the solar system, moon phases, eclipses and the seasons. This is one of 13 General Science questions on earth and space science, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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