**Question 6**On Earth, the equator regions are warmer than the north and south poles because _____.- The polar atmosphere is thinner and contains fewer greenhouse gases.- Solar radiation strikes the poles at a lower angle and travels through more atmosphere.- The poles are farther from the sun than is the equator.- The poles are permanently tilted away from the sun.

An equator is a imaginary line around the middle of earth or any spherical object like planet, star, etc. The earth is the widest (highest diamete) at the equator. The equator parts the earth into two hemispheres a. Northern Hemisphere and b. Southern Hemisphere. The equatorial regions receive sunlight at a direct angle as compared to the poles. Thus, the sunlight has to travel more distance through the atmosphere in the polar regions as compared to the equatorial regions. Because of this, the energy of the sunlight is dispersed more in the atmosphere and very less energy reaches the surface, while at the equator, the sunlight has to traverse a smaller path and has higher energy when it reaches the surface. Higher energy means more heat and more temperature. So, the reason is that the solar radiation strikes the poles at a lower angle and travels through more atmosphere.The amount of greenhouse gases in polar and equatorial regions is not significantly different to create a temperature difference so huge. So, the first option is wrong. The poles are farther from the sun, but this distance is nothing compared to the distance the sunlight travels from sun to the earth. If such distances made a huge difference, the whole earth would freeze when it is in apogee in it's elliptical orbit. So, the poles being farther is not the reason and third option is also wrong. Both the poles cannot be tilted away from the sun at the same time. The tilt is responsible for differences in uniformity of temperatures and sunlight in different regions. It does not affect the daily temperature significantly. So, the fourth option is also wrong.Answer : Second option. On earth the equator regions are warmer than the north and south poles because the solar radiation strikes the poles at a lower angle and travels through more atmosphere.