Briefly explain the current theory of Earth's origin, including how and why it came to be differentiated
by composition. What will be an ideal response?
In the solar nebula, gases and solid particles condensed in localized eddies and then accreted into
planetesimals. These bodies collided and grew until they became planets. The planets nearer the Sun
were small and composed of rock and metallic elements. One of these was Earth. Heat was generated
by meteorite impacts, gravitational compression, and nuclear reactions. The heat caused the material to
melt. Since it could now move, dense metals sank to the core and denser silicates to the mantle.
Lighter silicates rose to form the crust.
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A stream gathers water from an area called its ________
A) drainage basin B) ecosystem C) floodplain D) riparian area E) tributary
If the weather forecaster predicts a quick drop in air pressure, you can assume there will also be an increase in wind.
Indicate whether the statement is true or false.
Use your own words to describe the zones of accumulation and wastage. How does the snowline elevation change if climate changes?
What will be an ideal response?
If the width of the stream is 20 feet, the depth 5 feet, and velocity 10 feet per second, then the discharge is
A. 1000 cubic feet per second. B. 1000 square feet/second. C. 1000 feet/second. D. None of the answers are correct.