What type of desert can desert varnish, a shiny coating of iron and manganese oxides, most commonly be found?
A. erg
B. reg
C. seif
D. hamada
E. basin
B
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Humans affect mountain biomes by
a. plowing and conversion of pristine land to cropland b. depletion of groundwater c. increased air pollution from urban areas d. hydroelectric dams and reservoirs e. establishment of tree plantations
The main way new oceanic crust is created is by
A. sediment scraped off a subducting slab. B. eruption of lavas and solidification of magmas at depth. C. continental rifting, before the continents separate. D. continents that subside below sea level. E. magmas along an ocean-continent convergent boundary.
The amino acid pool consists of which of the following?
A) The amino acids found in our diets. B) The free amino acids found inside the cells. C) The free amino acids found outside the cells. D) both b and c
A(n) ________ is sandstone containing a significant amount of feldspar.
A. marble B. arkose C. shale D. graywacke E. quartz sandstone