What is the main reason that engineers have created tunnels? A. to dig through soft earth
B. to travel under the ocean
C. to develop new technologies
D. to make transportation easier​

Which descriptions refer to fog? check all that apply. burns off when it gets dark forms at or near the ground extends up to 10 miles into the sky found in areas near bodies of water forms when the ground warms at night after a cool, dry day

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.

How much water is in the ocean in cubic kilometers