Which of these best describes Earths mantle?

Select one:
a. Most dense layer, consists of the outer and inner parts
b. Thinnest under the oceans and thickest under continents
c. Middle layer, density increases with depth as pressure increases
d. Least dense layer overall, consists of two layers of different thickness

Which process collects sample soils from particular areas of a site? a.) repetitive sampling b.) restorative sampling c.) random sampling d.) representative sampling

Which statement best explains distribution of natural resources? people tend to settle in locations that have the resources they need for survival. some countries have resources that others lack, so trade between countries becomes vital. fossil fuels come from areas that have mountains and other areas that manufacture synthetic gas. areas with natural resources provide a higher standard of living and better quality of life.

Dubai is challenged by all of the following environmental factors except a. a warm and dry climate b. a lack of annual rainfall c. scarce freshwater resources d. a lack of valuable natural resources