Hotspots Flashcards
Why is the fixed plume hotter than surrounding?
Due to a temperature anomaly
Partial melt moves upwards and …
Erupts on ocean floor
What happens as partial melt cools and solidifies?
New rock builds up and breaks water surface
What is created at a hotspot? Name an example
An island - Hawaii
What causes plates to move?
Convection currents and distant slab pull
What happens to the island as the plate moves?
It gets moved away from the hotspot. Volcanism ceases at that island
What happens once the island has moved away from the hotspot?
Another island forms
What kind of chain is created?
A linear chain of extinct volcanic island
What happens to older islands as they move further away from the hot spot?
They subside
Before island disappears, what kind of coral grows?
Fringing reef, barrier reef, atoll.
