What local signs predict the approach of a low-pressure centre or a weather front?
What will be an ideal response?
Answers may vary.
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A permeable layer that transports water is called a(n) ____________________
Fill in the blank(s) with correct word
Hypoxia, or low-oxygen conditions, is generally considered to occur when oxygen in the water drops to ________ ppm.
A. 10 B. 5 C. 2 D. 15 E. 0
A(n) _______________ is similar to an alluvial fan, but its sediments are deposited underwater
Fill in the blank with correct word.
Plants are important to the development of karst formation primarily because
A) they provide the calcium carbonate necessary for karst topography to form. B) they lessen the impact of raindrops on the surface so the water can more rapidly flow into stream channels. C) the decay of large roots below the surface produces cavities which eventually enlarge to form caves. D) they supply organic acids that enhance the dissolution process. E) openings adjacent to their roots serve as microchannels that allow water to enter the rock.