Q2: Which of these age ranges corresponds to the range in ages of the basement rocks in Arizona and the Southwest?

a. About 1.8 to 1.4 billion years old.

b. About 4.0 to 3.5 billion years old.

c. About 150 million to 65 million years old.

d. About 500 million to 300 million years old.

Arizona is one of the state in the United States of America, located at the southwestern part of it. The rocks in this region are belongs to the precambrian age. The rocks that are present at the base are the igneous as well as the crystalline metamorphic rocks. With the increasing time, periodic mountain building process has taken place here, such as the Grenville orogeny during the Proterozoic, Nevadan orogeny as well as Sevier orogeny in the Mesozoic era.

The age of this basement rocks and the south east portion of Arizona is about 1.8 to 1.4 billion years old.

Hence, the correct answer is option (A).

Q2: Which of these age ranges corresponds to the range in ages of the basement rocks in Arizona and the Southwest? a. About 1.8 to 1.4 billion years old. b. About 4.0 to 3.5 billion years old. c. About 150 million to 65 million years old. d. About 500 million to 300 million years old.

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Q2: Which of these age ranges corresponds to the range in ages of the basement rocks in Arizona and the Southwest?

a. About 1.8 to 1.4 billion years old.

b. About 4.0 to 3.5 billion years old.

c. About 150 million to 65 million years old.

d. About 500 million to 300 million years old.