Which long-term outcome arises because effusive lava eruptions accumulate?

💡 Explanation

The formation of a shield volcano occurs due to successive lava flows spreading over a wide area; this is driven by magma viscosity differences. Because effusive eruptions produce fluid lava, layer after layer builds the broad, gentle slopes of a shield volcano rather than steep cones.

• Which outcome sharply increases when newly formed volcanic islands experience high rainfall?
• Which mechanism causes fault creep along the San Andreas fault in California?
• Which pattern results from combined Hadley cell circulation and the Coriolis effect on global wind directions?
• Which mass wasting process causes lobate terraces to form down slope in arctic environments?
• Which outcome occurs when thawing overburden destabilizes Arctic slopes?
• Which increasing risk to alpine communities results when permafrost thaw amplifies seismic ground motion?