What rock evidence leads geologists to conclude that much of Pangaea was an arid or semi-arid

environment? What will be an ideal response?


The extensive Permian red beds and evaporites found in western North America, central Europe,
and parts of Russia provide evidence for the dry conditions that existed in the interior part of the
Pangaea supercontinent. Arid conditions were caused because mountain ranges blocked much of
the moist, subtropical easterly winds, creating rain shadows.

Environmental & Atmospheric Sciences

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How many electrons are there in the third shell of sodium, Na (atomic number 11)?

A. none B. one C. two D. three

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As of 2009, according to the U.S. Census Bureau, what percentage of Americans lived in an MSA?

A) 15 B) 37 C) 50 D) 68 E) 84

Environmental & Atmospheric Sciences

Weathering is not influenced by vegetation

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

The discontinuous branch of Bowen's reaction series contains the mineral(s)

A. pyroxene, amphibole, and biotite B. pyroxene C. amphibole D. biotite

Environmental & Atmospheric Sciences