Desert soil is topped by ____
a. a mosaic of closely packed pebbles
b. alkaline, dark, and rich humus
c. acidic and light-colored humus
d. acid litter and humus
a
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If you see a lightning stroke and then, 15 seconds later, hear the thunder, the lightning is about ____ miles away.?
a. ?45 b. ?15 c. ?5 d. ?3 e. ?1.5
A person is more likely to die of ________ than any other cause
A) cardiovascular diseases B) infectious diseases C) starvation D) old age E) cancers
Compared to a person in a developed country, a person in a developing country is about eight times more likely to die from
A) cancer. B) injuries. C) cardiovascular disease. D) communicable diseases.
Why is peridote considered a coarse-grained ultramafic rock?
A) It contains a lot of silica. B) It contains a lot of feldspar. C) It contains a medium amount of silica. D) It contains very little silica.