The three phases of the Cordilleran orogeny are, from oldest to youngest, ____
a. Laramide, Sevier, and Nevadan
b. Sevier, Laramide, and Nevadan
c. Sonoma, Sevier, and Laramide
d. Nevadan, Sevier, and Laramide
e. Sevier, Nevadan, and Laramide
d
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Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Use the chart to answer this question.
Which represents the Cambrian explosion?
A. A B. B C. C D. D E. E F. F
What is the definition of planetary differentiation?
A) Separation of materials based on density B) Categorization based on chemical formulas C) Mixing of materials to produce a new compound D) Divisions of planets based on constituent materials
What kind of plant has nitrogen-fixing bacteria living in their roots?
A. legumes B. deciduous trees C. ferns D. mosses
A blue moon occurs once every few ________
A) centuries B) decades C) generations D) months E) years