We learned about gravitational pull today for a short lecture. The moon is the primary cause of the different levels of tides. The sun is also a cause, but it isn't as close to the Earth as the moon is, therefore making the gravitational pull of the moon to the Earth stronger. When the Earth, moon and sun are aligned, there is a very high tide and a very low tide.
Tomorrow is the second exam and it involves water chemistry, physics and oceanic circulation as well as atmospheric circulation, coral reef communities, sea turtles and sediments.
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