Using the data in this table, calculate the number of half-lives that have passed for the dike (unit D on this table).
A. 1
B. 2
C. 3
D. 4
E. 5
Answer: A
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A mid-ocean ridge is an example of
a. a continental-continental convergent plate boundary. b. a transform plate boundary. c. an oceanic-oceanic divergent plate boundary. d. a continental-continental divergent plate boundary. e. an oceanic-continental convergent plate boundary.
In the United States in 2014, we import
A) about three barrels of oil for every barrel we export. B) all of our foreign-produced oil from the Middle East. C) about 50% of our crude oil. D) 10 barrels of oil for every barrel we consume.
Food chains and food webs are basically the same thing
Indicate whether the statement is true or false
Which precipitation mechanism takes place when a warmer air mass rises after encountering a colder, denser air mass?
a. convectional precipitation b. frontal precipitation c. cyclonic (or convergence) precipitation d. orographic precipitation e. radiation precipitation