How old is the Precambrian Crust?

A) 0-500 million years
B) 500 million-1 billion years
C) 500 million-1.5 billion years
D) 1 billion-4 billion years


Answer: D

Environmental & Atmospheric Sciences

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Davisain theory is usually referred to as the _______.

a - equilibrium theory b - geomorphic cycle c - rejuvenation theory d - idea of concave slopes e - stream development theorem

Environmental & Atmospheric Sciences

At the time of Pangaea, South America and Africa were attached, forming a continuous landmass. Using Figure 19.2, describe what transpired in the past 225 million years to position the two continents where they are today.

What will be an ideal response?

Environmental & Atmospheric Sciences

Which of the following is not a very long-lived, radioactive isotope?

A) Rb-87 B) K-40 C) C-14 D) U-238

Environmental & Atmospheric Sciences

Erosion of the Taconic Highlands resulted in the development of a(n) ____________________ called

the ____________________. Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences