How does the biosphere contribute to soil creep? What will be an ideal response?
Burrowing animals can move soil where more animal-moved soil ends up moving downslope than
upslope; the net result is downslope transport. Trees are an important catalyst for soil creep. Every
time a tree blows over and its root wad tips up, soil is moved, usually downslope
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Your book states that a "sewage treatment plant removes 70% of the phosphorus and 50% of the nitrogen that flows through it". According to the Law of Conservation of Matter, there is no detectable increase or decrease in the quantity of matter during an ordinary chemical change. Assuming that only ordinary chemical changes occur in sewage treatment plants, how is the nitrogen removed?
A. denitrification B. nitrogen fixation C. biodegradation D. combustion
What causes a decrease in oxygen levels beyond the sunlit layer?
a. The respiration from marine animals and bacteria b. The by-products of photosynthesis c. There are fewer animals present d. Decreased saturation because of cooler water
Which type of physical weathering involves the removal of overlying materials?
A. mineral growth B. wedging C. unloading D. abrasion
Within the troposphere, the atmosphere gets warmer with increasing altitude.
a. true b. false