Answer:
At the equator, the sun is directly overhead at noon on these two equinoxes. The "nearly" equal hours of day and night is due to refraction of sunlight or a bending of the light's rays that causes the sun to appear above the horizon when the actual position of the sun is below the horizon.
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Answer: wind flows from areas of high to medium pressure at the earth's surface.
Explanation:
Pressure pattern drive wind pattern which in turns drives oceanic pattern.
Wind at the surface of the Earth flows from areas of high to medium pressure. The wind speed is determined by difference in barometric pressure between the linear distance and air columns over which the transition takes place.
Currents involve movement of ocean water masses, driven either by wind or by differences in temperature, salinity and density. The most important from a human perspective are the wind-driven surface currents that move water in the uppermost layer of the ocean.
Currents affect humans in several primary ways. Currents help shape the climate in the areas where we live, create the right conditions to support abundant ocean life in the areas where we fish, and change weather patterns through periodic events like El Nino/La Nina.
Ocean currents also cause upwelling in many areas like off in the inland parts of North America, where surface currents taking water away from the shore cause nutrient-rich water to well up from the ocean deeps. The abundance of nutrients in these areas forms fertile ground for kelp beds and marine fisheries, which in turn furnish food for humans. Alterations in current patterns like the El Nino/La Nina cycle affect humans as well by causing changes in local weather patterns in the years when they occur.
A jar contains 12 marbles 4 red 3 white 5 blue. A marble is randomly selected, it's color record, and then the marble is returned to the jar. A second marble is randomly selected. Find the probability that both marbles selected are blue
