Why did the people of China settle near the Chang Jiang river

As people in China turned to farming, they began to settle mostly on the North China Plain in Inner China. They grew crops and lived in villages near the Huang He. ... The Chang Jiang Basins were wet and fertile, but heavy rains may have made farming difficult.

The river starts in the high western mountains and winds its way down to the eastern plains. The silt it carries helps fertilize the surrounding lands, making the North China Plain a good place to settle down and grow crops. river is said to have flooded more that 1,500 times, causing much damage and loss of life.

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the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)