Discussion
The magma-ocean concept was developed to explain the petrology and geochemisty of :
Answer: B
The magma-ocean concept was developed to explain the Moon.
Apollo 11 samples included fragments of anorthosite. To explain a crust made of light plagioclase-rich rock, Wood and Smith proposed in 1970 that the outer few hundred kilometres of the young Moon were molten: plagioclase floated to form the anorthositic highlands, while olivine and pyroxene sank to form the mantle. The europium anomalies of lunar basalts and the KREEP component fit this model.
Magma oceans have since been suggested for the early Earth and Mars too, but the concept was first developed for lunar petrology and geochemistry. Jupiter is a gas giant without a rocky crust of this kind.
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