Controls
Tip: Basaltic magma is typically low viscosity → lava flows build a broad shield.
Andesitic magma is typically higher viscosity + more gas → pressure builds and eruptions are more explosive, piling up layers into a steep cone.
Simulation View
Legend
Fresh lava
Solidified lava
Ash / pyroclastics
Bedrock
Eruption style depends mainly on viscosity and gas.
Basaltic = effusive; Andesitic (often subduction) = explosive/episodic.