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).
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.
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.