The appearance of hot spots and volcanoes at Earth's surface is evidence of

Which objects allow humans to access groundwater? check all that apply.

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.

Where does the availability of water pose the greatest problem