Magnetic Stripes Name: _________________ Period: _____________ 1. What was discovered about the Earth’s magnetic field in the 1950’s and 1960’s? 2. How many times have the north and south magnetic poles flipped in the past 4 million years? _________________________ 3. Which scientists explained how the pattern of magnetism in the seafloor relates to plate tectonics? ____________________ & _______________________ 4. What theory did they (from question 3) begin their explanation with? 5. What type of rock (rock name) forms from magma rising from ocean ridges and records prevailing magnetic conditions? 6. What might the absence of a magnetic field do to living species?