The earth's crust is broken up into a series of more-or-less rigid plates that slide around due to motion of material in the mantle below. Although the speeds of these plates vary somewhat, they are typically about 4.80 .cm/yr Assume that this rate remains constant over time.
1-If you and your neighbor live on opposite sides of a plate boundary at which one plate is moving northward at 4.80 cm/yr with respect to the other plate, how far apart do your houses move in a century?
2-Los Angeles is presently 550 south of San Francisco, but is on a plate moving northward relative to San Francisco. If the 4.80 cm/yr velocity continues, how many years will it take before Los Angeles has moved up to San Francisco?