The major challenge facing urban areas of north africa is a. polluted water c. earthquakes b. overcrowding d. ethnic conflict

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.

Why the moon is not visible from earth during the new moon ?

Which of these is the sound of fish slapping against human flesh?