The main reason polar regions are cooler than the equator is that . The main reason polar regions are cooler than the equator is that . 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 permanently tilted away from the sun the poles are farther from the sun than is the equator

Data courtesy of the un development programme 2006-2008 and world bank 2009 the chart above compares measures of development using the hdi and gdp. why might turkey rank lower in the hdi indicator even though it has a high gdp? a. turkey has a lower gdp than comparable countries in the hdi ranking. b. turkey must increase its hdi to have a higher gdp ranking. c. turkey is only compared to other european countries in gdp, not to the world, as it is in the hdi. d. turkey may struggle to provide adequate education or health care, or it may have a lower life expectancy.

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer

Put these ecosystems in order of least biodiversity to most biodiversity 1. mediterranean forest 2. indonesian rain forest 3. arctic ocean