Which of these is still affecting north america geologically, although it ended 10,000 years ago?

a. an earthquake

b. the last glaciation

c. a major subsidence

d. chemical erosion of the grand canyon

What is the approximate circumference of the circle shown below? 12.2 cm

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.

Where would you be most likely to find a freshet?