What technology led to people settling down in communities and starting a civilization?

Ahill is made of rock particles of different sizes. which of these agents of erosion probably caused the hill to form?

Computer models can scientists predict weather. some computer models can show the predicted path of hurricanes. what other events could a computer model warn us of? a) undersea earthquakes , tornadoes, and avalanches b) tornadoes c) avalanches d) undersea earthquakes

How does the bare soil surface type affect the amount of runoff