how do volcanic chains indicate tectonic movement?
in the Hawaiian islands for instance
- FredLv 51 month agoFavorite Answer
As our Earth formed up from the material from dying stars the heaviest atomic elements sank deep into the Earth's liquid core. In that core they produced heat by the atomic decay of those unstable heavy elements.
That heat forms convectional currents in the Earth's mantle. Where two counter flowing currents rise is referred to as a "hot spot" with a Mantle Plume producing Magna chambers that rise to the Earth's surface as Volcanoes.
As the Pacific Plate slowly moves Northwest new Hawaiian islands form to the East of the West drifting Pacific Plate.
A new island is forming East of 'the big island' known as "Loihi" now forming below ocean level.
The indication of 'tectonic movement" is the weather diminishing Hawaiian island chain trailing off to the North West. The movement of Pacific Plate over the top of the geologic 'hot spot'.
- rogerLv 71 month ago
Yep. Island arcs. Like the Hawaiian Islands or the Aleutian islands show the earth's crust moving past a hot spot.
- BillLv 62 months ago
tectonic plates are floating masses of earth crust and when pushed together stop the magma fro coming to the surface, When the plates move and allow a crack then the magma pushes up and forms volcanoes or allows inactive volcanoes to become active again. So you will find these cracks all along the edges of the plates
- MattLv 62 months ago
Hot spot stays in the same place while the plate moves above it. Hot spot activates creates an island, goes dormant, plate moves, reactivates and creates a new island, rinse and repeat.