Desert varnish consists of ________.
A) pesticide and other pollutant residues
B) thick coatings of iron and magnesium oxides
C) dust deposits affected by microorganisms
D) carbonate cements with iron impurities (e.g.,siderite)
Correct Answer:
Verified
Q19: To qualify as a desert,a region must
Q20: At 30° north latitude,at the northern edge
Q21: Evaporite deposits in coastal,subtropical regions derived from
Q22: Badlands are characterized by _.
A) thick caliche
Q23: Native Americans produced petroglyphs by etching into
Q25: A mushroom-shaped landform consisting of a column
Q26: The saltation of sand involves _.
A) spherical
Q27: When fine-grained sediment is blown away as
Q28: Calcrete (caliche)forms in a desert climate through
Q29: In the figure below,the sand grains are
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