Plants are important to the development of karst formation primarily because
A) they provide the calcium carbonate necessary for karst topography to form.
B) they lessen the impact of raindrops on the surface so the water can more rapidly flow into stream channels.
C) the decay of large roots below the surface produces cavities which eventually enlarge to form caves.
D) they supply organic acids that enhance the dissolution process.
E) openings adjacent to their roots serve as microchannels that allow water to enter the rock.
D
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After the flanks of a volcano are eroded, igneous rock that crystallized within the "throat" or "plumbing system" of the volcano may form ___
a) a neck b) a sill c) a laccolith d) a batholith e) a diapir
Over the past 50 years the average rate of sea level rise has been 1.8 mm per year. Explain the two primary factors responsible for this rise in sea level
What will be an ideal response?
Sea snakes spend less than half their time in the marine environment.
Answer the following statement true (T) or false (F)
Which of the following is the difference between lysine and ornithine?
A) Lysine has one less CH2 group than does ornithine. B) Lysine has one more CH2 group than does ornithine. C) The side chain in ornithine is cyclic but that in lysine is linear. D) The side chain in ornithine is linear but that in lysine is cyclic.