Plate C is continental lithosphere, and Plate D is oceanic lithosphere. An auton

Question

Plate C is continental lithosphere, and Plate D is oceanic lithosphere. An autonomous (robotic) observatory is built on the seafloor (indicated by a blue polygon). The observatory is built to last indefinitely.

The convergence rate between the two plates is 5 mm/yr (millimeters per year). In 20 million years from now, where on the red number line will the observatory be?

Select one:

a. 0 km

b. 50 km

c. 100 km

d. 150 km

e. 200 km

f. 250 km

g. 300 km

Explanation / Answer

as if it moving in a speed od 5 mm / year

after 20 million years the distance moved is 5 x 10^-3 x 20x10^6 = 100 km

as the reference is moving it gets dispalaced by 100 Km

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