Wind-blown dust-sized particles of silt and clay can settle out to form thick blankets of sediment called _____ that may cover or bury the existing topography over widespread areas
a. barchans
b. seif
c. deflation hollows
d. loess
e. clay pan
d
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Which of the following can undergo keto-enol tautomerism?
A) 2,4-dimethyl-3-pentanone B) 2,2,4,4-tetramethyl-3-pentanone C) both a and b D) neither a nor b
In regions with ________, basic ions are leached from the soil and more acidic materials are left behind.
A. high rainfall B. high temperatures C. permafrost D. low rainfall
The beach face ________.
A. is found between the summer and the winter berm B. is found between high-tide and low-tide levels C. is the same as the low-tide terrace D. lies under the surf zone E. appears between an offshore bar and a low-tide terrace
Electrons are positively charged particles in the nucleus of an atom. Indicate whether the statement is true or false