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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Which process removes carbon dioxide from the atmosphere?
A. percolation
B. anaerobic respiration
C. aerobic respiration
D. transpiration
E. photosynthesis
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.
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
The ________ is produced by refraction caused by ice crystals
A) glory B) corona C) halo D) rainbow