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If a mid-oceanic ridge, high heat flow, and young basalt occur together, what is the best explanation?

Answer and explanation

Correct answer: It may be an active sea-floor spreading zone

A mid-oceanic ridge is a long underwater mountain system where tectonic plates move apart. High heat flow suggests that hot material is rising from below, and young basalt indicates that fresh oceanic crust has recently formed from cooling magma. When these three clues occur together, they strongly point to sea-floor spreading at an active divergent boundary.

Option A is therefore the best explanation: the area may be an active sea-floor spreading zone. A desert, glacial erosion area, or river delta does not explain the combination of an oceanic ridge, strong heat flow, and young basalt. The evidence must be read as a group. Ridge plus heat plus newly formed basalt is the characteristic pattern of new oceanic crust production.

Related tags

RidgeHeat-FlowYoung-Basalt

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