why do shield volcanoes have weak eruptions?\n\na. they form calderas.\nb. they feature magma with very low…
why do shield volcanoes have weak eruptions?\n\na. they form calderas.\nb. they feature magma with very low viscosity.\nc. they have excess magma.\nd. they feature magma with high silica content.
Answer
Answer:
B. They feature magma with very low viscosity.
Brief Explanations:
Low - viscosity magma in shield volcanoes allows gases to escape easily, resulting in weak eruptions. High - silica content (D) makes magma more viscous and leads to explosive eruptions. Forming calderas (A) is a result of large - scale collapse after an eruption, not a cause of weak eruptions. Excess magma (C) doesn't directly relate to weak eruptions.