Remains or traces of prehistoric organisms preserved in rocks are ____
a. fossils
b. evaporites
c. formations
d. natural selections
e. minerals
a
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Caliche is
A) fragmented quartz crystals that tumble down a cliff. B) limestone crystals that form by precipitation. C) calcite cement in desert rocks. D) silica cement in ancient river-bed rocks.
A person traveling the Silk Road in the Middle Ages would have a choice of ways to skirt the Takla Makan desert: to the north along the Tian Shan mountains or to the south along the Ganges River
Indicate whether the statement is true or false
In the name 2-methyl-2-propenal the numbers represent which of the following?
A) the position of the methyl substituent and the position of the carbonyl group B) the position of the methyl substituent and the position of the alkene double bond C) the position of the carbonyl group and the position of the alkene double bond D) None of the above, since the name does not correspond to a real compound.
Which is not a regional name for a wash or gully?
A) Nullah B) Donga C) Wadi D) Gibber E) Coulee