An oligotrophic lake tends to have relatively high levels of dissolved oxygen
Indicate whether the statement is true or false
T
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The physical and human geographies of North America are greatly affected by the region's surface _______________.
Fill in the blank(s) with the appropriate word(s).
A steep slope implies a
A. steep gradient and closely-spaced contours. B. weak gradient and closely-spaced contours. C. steep gradient and widely-spaced contours. D. weak gradient and widely-spaced contours.
What is the primary cause of oxygen depletion in the disphotic zone?
a. photosynthesis b. chemosynthesis c. primary production d. buffering reactions e. heterotrophic respiration
Base level of a stream is a balance of
A) stream power and sediment load. B) velocity and discharge. C) precipitation and infiltration. D) runoff and evaporation.