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

The increase of pollutants from in mexico has raised concerns about garage to health and the environment

Which statements about wells are true? check all that apply. a) wells bring groundwater from the unsaturated zone to the surface of the water. b) wells need to be drilled below the water table. c) if water is pumped from a well too quicky, the well may run dry. d) water from wells is generally not safe to drink. e) water gushes from artesian wells due to pressure.

Physical features of central america look at the map above which of the following is true