12.2.2. Mount Etna erupted in 1669, 1780, and 1865. When molten lava hardens, it retains the directioo of the Earth's magnetic field. Three blocks of lava were examined from each of these eruptions and the declina tion of the magnetic field in the block was measured (177). The results are given in the following table. Do tliese data suggest that
the direction of the Earth's magnetic field shifted over tile time period spanned by the eruptions? Let a = 0.05.
1669 1780 1865
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