What is the name for the lowest layer of the atmosphere, which is most influenced by human activities?
a. terrasphere
b. stratosphere
c. mesosphere
d. troposphere
e. ionosphere

What does the word submerged mean in the following sentence? after it rained for three days in a row, the streets were completely submerged.

Ahill is made of rock particles of different sizes. which of these agents of erosion probably caused the hill to form?

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.