1. The seafloor spreading hypothesis explains how • Ocean ridges spread/ open up over time and are filled with new magma • Rocks get progressively older farther away from the ridge crests • Symmetrical patterns of magnetic reversals on either side of the mid ocean ridges • All of the above • None of the above

2. Paleomagnetism is a field of study in geology in which geologists • Study how magnetic property came to earth • Study how the Sun’s cosmic rays affect Earth’s Magnetic field • Study magnetite-rich rocks as a means of recording historical changes in Earth’s magnetic field • Study how charged particles from the Su are modulated by the Earth’s magnetic field

3. Which of the following statements concerning paleomagnetism is FALSE? • Geomagnetic reversals cause the movements of the plates (tectonics) • Occasionally, the Earth’s magnetic field reverses, so the north and south poles switch polarity • Rocks possessing paleomagnetism indicate the direction of the magnetic poles at the time the rocks crystalized • Magnetic stripes on the seafloor provided evidence for sea-floor spreading