4059773
Beschreibung
Mindmap von Emily Arrowsmith, aktualisiert more than 1 year ago
|
Erstellt von Emily Arrowsmith
vor mehr als 10 Jahre
|
|
Hot Spots
- Vulcanicity is usually associated
with plate boundaries.
- In the Pacific Ocean, there are the Hawaiian
islands that are not connected to a boundary
but they are volcanic areas.
- The cause of this is a localised "hot spot". Hot spots are caused by
radioactive elements in the magma. Magma rises and eats into the
above plate. Lava works through the plate and reaches the surface
creating active volcanoes above the hot spot.
- The hot spot it stationary so as
the Pacific plate moves, a line of
volcanoes is created. Only the
volcano above the hot spot is
actually active, the rest are
extinct. Over time, the extinct
volcanoes suffer subsidence
and marine erosion meaning
that they are reduced to
seamounts below the ocean.
These are known as guyots.
- The hot spot it stationary so as
the Pacific plate moves, a line of
volcanoes is created. Only the
volcano above the hot spot is
actually active, the rest are
extinct. Over time, the extinct
volcanoes suffer subsidence
and marine erosion meaning
that they are reduced to
seamounts below the ocean.
These are known as guyots.
- The cause of this is a localised "hot spot". Hot spots are caused by
radioactive elements in the magma. Magma rises and eats into the
above plate. Lava works through the plate and reaches the surface
creating active volcanoes above the hot spot.
- In the Pacific Ocean, there are the Hawaiian
islands that are not connected to a boundary
but they are volcanic areas.
Medienanhänge
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