Which outcome occurs when magma cools rapidly within a volcanic vent of a lava dome?

💡 Explanation

A glassy obsidian crust forms because extremely low water content and the rapid cooling prevent crystal formation—vitrification—therefore creating an amorphous solid rather than a crystalline one; rather than forming blocky or ropey lava.

• Which outcome occurs when earthworm populations facilitate bioturbation in topsoil?
• Which outcome primarily results as glacial till undergoes pedogenesis?
• Which consequence results when increased rainfall saturates unconsolidated sediment above karst bedrock?
• Which downslope movement increases when permafrost degradation occurs?
• Which feature results from increased carbonic acid levels inside karst caves?
• Which process rapidly alters river delta morphology when coarse alluvial sediment deposition reduces flow capacity?