When the crust breaches at a rift valley, basaltic magma can flow out without the assistance of a volcano. Thus, option D is correct.
What is basaltic magma eruptions?
The most frequent type of volcanism on Earth and planetary bodies are basaltic eruptions.
The low viscosity of basaltic magmas prevents fragmentation and favors effusive and lava containing activity, yet basaltic eruptions can still be extremely explosive and dangerous.
However, basaltic lava fountains and fissure eruptions continue to produce explosive fountains that are hundreds of meters high.
Olivine, pyroxene, and plagioclase are typical minerals found in basalt. A temperature range of 1100 to 1250 °C causes basalt to erupt.
Therefore, at D site, basaltic magma eruptions take place.
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