Desert varnish consists of ____________.
A) pesticide and other pollutant residues
B) dusts of iron and magnesium oxides
C) dust deposits affected by microorganisms
D) carbonate cements with iron impurities,for example,siderite.
Correct Answer:
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Q1: The Sahara is a desert primarily because
Q5: Most regions that are now deserts have
Q8: Most hot deserts _.
A)retain their high temperatures
Q9: Some of the physiographic features that cause
Q11: The highest recorded temperature on Earth was
Q12: The most expansive hot deserts on Earth
Q19: To qualify as a desert,a region must
Q20: At 30° north latitude,at the northern edge
Q40: An arroyo is a steep-sided,linear trough produced
Q42: Vegetation in the desert consists of _.
A)cacti
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