Mark first arrivals in the following seismograph record. there is a clear break in slope, so it means you are dealing with a 2-layer case. use a metric ruler to measure times, because precision is going to make a big difference. the first arrival for the 800 m geophone happens to be at 800 ms. once you have measured your times use excel to plot your data, like you did in question 3, to calculate seismic velocities and depth to the interface. (l6pts) 800 ms geophone distance (m)

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The reason why i feel that the theory of plate tectonics is correct because scientists have found dinosaur bones of the same species in africa, asia, and in the americas. which means that they must have been together at one point in time. plate tectonics is also how the hawaiian islands were formed. as the plate hawaii is on was moving north west, magma would melt through the sea bottom and hardening. forming into the island chain. plate tectonics also explains the mariana trench. two plates were moving away from each other and made a giant crack in the ocean floor running 2,550 kilometers (1,500 miles)  long.