PORTLAND, Ore. (KATU) — Ever notice the ocean suddenly creep up the shore, and then pull back hours later? About twice a day, the coast experiences two high tides and two low tides. But what makes ...
What causes the ocean to swell? It's not just the Moon that has a gravitational pull on spring tides. The Earth’s gravitational force pulls the waves down, thus resulting in high and low tides. A ...
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