TIDES CHAPTER 24.3

TIDES The periodic rise and fall of the ocean surface due to the gravitational pull of the moon and Sun The positions of the moon and sun relative to Earth affect both the time and height of the tides High Tide: tide reaches the highest point on the shore Low Tide: tide reaches the lowest point on the shore

DIRECT HIGH TIDE Gravity is stronger when objects are closer together The Moon pulls water on the side of Earth nearest it more strongly than it pulls on Earth itself Causes a bulge in the ocean on the side nearest the moon Bulge is the direct high tide

INDIRECT HIGH TIDE Occurs on the other side of Earth opposite the moon The moon pulls more strongly on Earth’s center than it pulls on the water Earth is being drawn away from the water, leaving a bulge behind

LOW TIDES The bulges on opposite side of Earth pull water away from the areas that lie between the two high sides Creating low tides areas

MOON’S MOVEMENT Since the moon moves around Earth, the bulge also move around Earth The moon rises about 50 minutes later each day and so do the tides

SUN’S EFFECT ON TIDES The Sun also influences Earth’s waters The Sun’s tidemaking effect is only about half that of the moon because it is so much father away It can either enhance or detract from the moon’s effect

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