How long will a plastic bottle last on the beach

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.

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand