Question

seafloor spreading generates __________ magma

basaltic
granitic
rhyolitic
dacitic

Explanation:

Seafloor spreading occurs at mid - ocean ridges. The magma that wells up during seafloor spreading is basaltic in composition. Basaltic magma is low in silica content, which allows it to flow easily and is typical of oceanic crust - forming processes. Granitic, rhyolitic, and dacitic magmas are more associated with continental volcanic activity and have higher silica contents.

Answer:

A. basaltic