List two ways in which streams erode their channels
What will be an ideal response?
Sufficiently strong water flow can dislodge particles from the channel and lift them into the moving water. A stream can also erode bedrock with by the particles it carries, acting as abrasives or drills into the streambed.
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Which is more dangerous: touching a faulty 120-V lamp socket or a Van de Graaff generator charged to 100,000 V?
A. Generator. B. Lamp socket. C. both equally D. can't be estimated
The debt crisis refers to
A) the high debt service many peripheral countries must pay on international loans. B) the increasing debt service that banks are unable to collect from students and credit card holders. C) the loans that entrepreneurs in core countries are unable to get from investment banks. D) the difficulty core countries have in balancing their budgets. E) the increasing number of bankruptcies occurring in core countries.
One of the special characteristics of deserts is the ________
A) complete absence of precipitation B) lack of trees other than palms C) prevalence of soil creep D) frequent presence of basins of internal drainage E) complete absence of vegetation
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