Answer:
As the river erodes the landscape in the upper course, it winds and bends to avoid areas of hard rock. This creates interlocking spurs, which look a bit like the interlocking parts of a zip. When a river runs over alternating layers of hard and soft rock, rapids and waterfalls may form.
Answer:
The Orpheus theory, which says that a planet-sized body once collided with Earth and that it sent some of the material into orbit, forming the moon.
The creation of the Salton sea was a result of an accidental diversion of the Colorado River.
The biosphere includes the outer region of the earth (the lithosphere) and the lower region of the atmosphere (the troposphere). It also includes the hydrosphere, the region of lakes, oceans, streams, ice and clouds comprising the earth's water resources.
