How high does the earth's atmosphere extend? a. 100 m b. 1,000 m c. 10 km d. 100km

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.

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic

Read the article titled "castro resigns." why did the us impose trade sanctions against cuba in 1962?