hotstops/magma plumes

Explain hotspots

Hotter than any surround magma, not related to plate boundaries. This extreme heat = magma plumes. Come from the magma and rises and burn through weaker parts of the crust = volcanoes and islands happening far away from the plate margins

Explain how island chains are formed

1. Magma plume stays in one place but the tectonic plates continue to move

2. Volcanoes are active when under magma plume but extinct when not as there is no magma to supply

What does it mean if volcano is furthest away

It is the oldest

Explain volcanoes at constructive plate boundaries es

→ shield volcanoes, explosions are less explosive, lava is basaltic (runny like honey), low gas content/viscocity and high temp

Explain volcanoes at destructive plates

→ composite volcanoes, steep slopes due to thicky and sticky lava. Eruptions are explosive (andesitic or rhyolitic flows), high gas content and viscosity, low temp