These regions are the primary source of tholeiitic basalt. For 10 points each:
[10m] Name these regions whose basalt deposits, known by a four-letter acronym, provide evidence for the Vine–Matthews–Morley hypothesis, which attempts to explain banded patterns that appear around these regions.
ANSWER: mid-ocean ridges [accept MORBs; prompt on seafloors or divergent plate boundaries]
[10e] According to the Vine–Matthews–Morley hypothesis, MORBs exhibit striping corresponding to reversals of this entity. The dynamo theory explains the existence of this entity, which is generated by nickel and iron convection in the outer core.
ANSWER: Earth’s magnetic field [or Earth’s B-field]
[10h] Tholeiitic basalt can be found at the beginning of the tholeiitic magma series, which ends with the tholeiitic variety of this rock. This rock has the most silica content in the series in contrast with andesite and dacite.
ANSWER: tholeiitic rhyolite
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