Drivers of any age must take a vision test with each renewal. In 2011, the legislature turned away a proposal to test older driversâ reflex and reaction times starting at age 75, and to require every-six-months renewals for people 90 and older.
What causes the tides? It is the gravitational attraction of the sun and moon that cause waters of the ocean to raise and lower at different parts of the earth. Tides occur in oceans, and to a much smaller extent, tides also occur in large lakes, in the atmosphere, and within the solid crust of the earth.
They occur because of the difference in gravitational effect on one side of an object (like Earth) compared to the other. Here's how they work (full explanation of tides): The ocean on the side of Earth facing the moon gets pulled toward the moon more than does the center of the planet. This creates a high tide.