1. Approximately how long woul it take to close a major ocean basin, such as the

Question

1. Approximately how long woul it take to close a major ocean basin, such as the pacific ocean by subducation? Hint look up information on subducation rates and also examine the width of oceans such as the pacific.

a. about 1 million years

b. about 100 million years

c. 675 thousand years

d. 4279 years

e. 4.55 billion years

2. At the highest average plate tectonic speed approximately how long would it ake to travel from san freancisco to los angeles( about 500 kilometers in distance)? Alternatively, another way to look at this is how long would it take for the san andreas fault system to move los angeles so that it is directly west of san frenciso

a. 9.58 seconds

b. between 2.4 million and 3.3 milion years

c. 544 million years

d. 4.55 billion years

e .6557 years

f. 2 hours 6 mintues, 47 seconds.

Explanation / Answer

both are (b)

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