What is a floodplain and how is it formed?
Floodplains constitute the often extensive, low-gradient land areas composed of alluvium that lie adjacent to many stream channels. Floodplains are aptly named because they are inundated during floods and because they are at least partially composed of vertical accretion deposits, the sediment that settles out of slowing and standing floodwater. Most floodplains also contain lateral accretion deposits. These are generally channel bar deposits that get left behind as a stream gradually shifts its position in a sideways fashion (laterally) across the floodplain. As the meandering stream wanders from side to side, it widens the valley by lateral erosion before leaving behind those lateral accretion deposits.
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Which of the following describes when the use of sprinklers to prevent crop damage from cold air works best?
A. when the surface air temperature remains below freezing for a few hours B. when the air is fairly humid C. when the ice is allowed to cool to -15° C D. when the air is fairly dry
The combined albedo of the earth and the atmosphere is approximately:a
4%. b. 10%. c. 30%. d. 50%. e. 90%.
Why do negative feedback loops tend to diminish the effect of disturbances?
What will be an ideal response?
In which region of the world would you expect irrigation to be most critical?
A) Rainfall is high. B) PET is equal to rainfall. C) PET is lower than rainfall. D) PET is higher than rainfall. E) Rainfall is low.