Suppose an isotope has a half-life of 50 million years, and 1/8 of the sample remaining consists of that isotope. What is the age of the rock from which it was taken?
A)150 million years
B)300 million years
C)400 million years
D)600 million years
E)800 million years
Question 2Human activity causes most small landslides.
Indicate whether the statement is true or false
Question 3Who is generally credited with developing the concept of continental drift? Briefly summarize his idea. List at least three examples of evidence he claimed supported his hypothesis. Why was his idea, at least in part, rejected by many geologists of his time?
Question 4When an atom of Uranium-238 undergoes alpha decay, it becomes ____.
A)U-234
B)U-236
C)Th-234
D)Th-236
E)Th-238
Question 5The angle of repose for dry unconsolidated material is about 45 degrees.
Indicate whether the statement is true or false
Question 6How does plate tectonics theory relate to world economics?
Question 7When an atom undergoes alpha or beta decay, it ____.
A)becomes an ion of the same element
B)becomes an isotope oh the same element
C)becomes a completely different element
D)may or may not become a completely different element
E)becomes permanently stable
Question 8The removal of vegetation is a significant cause of slope failure and mass wasting.
Indicate whether the statement is true or false
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