An imaginary surface extending beneath the continents which limits how deep streams may cut is _______.
a - grade
b - a trellis
c - traction
d - a knickpoint
e - base level
e - base level
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A positive effect of water seeping through a landfill is that it
A) stops the production of biogas. B) promotes the decomposition of paper and other biodegradable organics. C) helps petroleum-based plastics decompose. D) reduces the amount of groundwater contamination.
The ________ is produced by refraction caused by ice crystals
A) glory B) corona C) halo D) rainbow
Which process removes carbon dioxide from the atmosphere?
A. percolation
B. anaerobic respiration
C. aerobic respiration
D. transpiration
E. photosynthesis
In Kano, a north-central Nigerian state, commercial agriculture is dominated by these products:
A) soybean, rice B) cotton, cocao C) vegetables, corn D) wheat, barley