0
Volcanic islands form when volcanic activity initiates on the sea floor. Over many years the rock formed by successive eruptions builds up, eventually breaching the surface to form islands. This can occur in two geologic settings: hot spots and oceanic subduction zones. With a hot spot, extra hot mantle material wells up in a plume originating near Earth's core. Some of this melts beneath the crust and the resulting magma rises up through the crust, erupting to form volcanoes. This is how the Hawaiian Islands formed. In an oceanic subduction zone, two plates consisting of oceanic crust collide. One plate slides under the other an into the mantle. Seawater trapped in the rock and sediment seeps into the hot mantle rock, altering the chemistry and allowing it to melt into magma. This then rises through the crust to form volcanoes. Many of the Aleutian Islands formed by this proceeds. A similar process can occur with an oceanic plate subducting under a continental plate, forming volcanoes along continental margins.
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
How were the low islands of micronesia formed?
The low islands of Micronesia were formed by coral.
How is THE guano islands formed?
it is formed by the droppings of birds
Do islands form from volcanos?
Some islands are formed by volcanoes, but most are not.
What Hawaiian Islands were formed by which constructive process?
The Hawaiian Islands are formed by the ocean structures known as submarine volcanoes. They continue to build the Pacific islands.
How are folded lmestone islands formed?
they are formed when the tectonic plates are shifted
How are mangrove islands formed?
mangrove islands are formed by
How are hawaiin islands formed?
they were formed when underwater vocaneoes erupted and formed the hawaiin islands
How was the cayman islands formed?
the Cayman Islands were formed from an eruption of an underwater volcano.
Are the hawaiian islands formed at a subduction boundary?
Not. The Hawaiian Islands are formed at a hot spot.
What is the difference between an atoll and a high island?
An atoll is a ring-shaped coral reef surrounding a lagoon with no central high land, while a high island is a tall island formed by volcanic activity or tectonic uplift. Atolls are typically found in tropical regions, while high islands can be found in various environments.
How are some islands in the ocean formed?
The Hawaiian Islands were formed and are still being formed right now by volcanic activity.
How were Hawaiian islands were formed?
Volcanoes formed the Hawaiian Islands over millions and millions of years.
How were the low islands of micronesia formed?
The low islands of Micronesia were formed by coral.
What islands was formed from volcanoes?
They are volcanos that formed around japan
How is THE guano islands formed?
it is formed by the droppings of birds
How the Guano islands formed?
it is formed by the droppings of birds
How and why the Hawaii islands do they exist?
The islands were formed from erupting volcanoes.
