Overland flow can concentrate in small grooves called ________, which can enlarge to form ________
A) rills; gullies
B) striations; potholes
C) gullies; rills
D) potholes; striations
E) striations; gullies
A
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Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is
A. often less. B. definitely less. C. the same. D. actually more.
Many of the world's major medicines are indirectly derived from:
A. Biodiversity. B. Eutrophication. C. Labor-intensive agriculture. D. Natural selection.
Eastern North America became the continent's manufacturing center in part because it had access to the continent's
A) largest markets. B) most extensive sources of essential raw materials. C) newest highway systems. D) most advantageous climate. E) oceangoing transportation links to Asia.
Why isn't the Grand Canyon of the Colorado simply a product of the erosion by the river?
What will be an ideal response?