Think about the types of instruments that a marine scientist or geologist might use to gather evidence to support the theory of plate tectonics. What specific instruments were needed to gather each of the following types of data? (use the "Developing the Theory" section)
(a) demonstration of the ruggedness and youth of the ocean floor
(b) confirmation of repeated reversals of the Earth’s magnetic field in the geologic past
(c) emergence of the seafloor-spreading hypothesis and associated recycling of oceanic crust
(d) precise documentation that the world’s earthquake and volcanic activity is concentrated along oceanic trenches and submarine mountain ranges

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