Remains or traces of prehistoric organisms preserved in rocks are ____

a. fossils
b. evaporites
c. formations
d. natural selections
e. minerals


a

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences

Which is not a regional name for a wash or gully?

A) Nullah B) Donga C) Wadi D) Gibber E) Coulee

Environmental & Atmospheric Sciences