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Why do volcanoes erupt on islands?
It is not so much that volcanoes tend to occur on islands as much as many islands are formed by volcanoes. Subduction zones and hot spots often cause volcanoes to develop on the sea floor. Erupted material then piles up to form islands.
When does volcanoes occur more often?
Volcanoes occur at divergent and convergent plate boundaries due to the fact that crust is either being destroyed or created. Volcanoes also occur at hotspots, for example in Hawaii. Hotspots occur where the crust is particularly thin or weak, and plumes of magma rising from the asthenosphere (between upper mantle and the crust) end up giving rise to volcanoes or volcanic islands.
Which volcanoes are located at hot spots?
Hot spots have generated all types of volcanoes but are most often. If you mean to ask about specific volcanoes, there are too many to count, so a few groups and notable volcanoes will be listed: The volcanoes of Hawaii The volcanoes of the Canary Islands The Yellowstone supervolcano The San Francisco volcanic complex (including Sunset Crater and the San Francisco Peaks) The volcanoes of Iceland (associated with both a hot spot and a divergent plate boundary).
Why can volcanoes be both constructive and destructive?
The ash and lava that a volcano erupts can build up the land, which include the mountain of the volcano itself. In the case of underwater volcanoes, this process can created new islands. At the same time, the slopes of volcanoes are often unstable and prone to landslides, which are destructive. Very large eruptions can form large explosion craters and may even result in the volcano collapsing to forma depression called a caldera.
What are volcanoes created from?
Volcanoes are created from the building up of lava flows or ash and cinder deposits. This occurs inland from subduction zones, at 'hot spots' where mantle plumes melt the lithosphere, and most often at mid ocean ridges.
Do the volcanoes erupt often in the Grand Canyon?
There are no volcanoes in the Grand Canyon.
In plate tectonic theory what does a hot spot create?
A hot spot will often generate volcanoes. Many hot spots show a chain of extinct volcanoes in one direction, indicating that the plate moved over the stationary hot spot.
Do composite volcanoes erupt violently?
Yes. Composite volcanoes often produce violent eruptions.
Where are volcanoes most often formed?
in the ocean
How often do dormant volcanoes erupt'?
Never.
Which continents contain volcanoes?
Cinder cones have been found on every continent except Antarctica as well as various islands. Antarctica likely has or has had cinder cones as well that have since been buried or scraped away by glaciers.
Is landform a permanent feature?
They are often long term, but not permanent. Over long periods of time, some can change, like mountains growing slowly. Sometimes change can be more sudden, like rockfalls causing damage, earthquakes changing a landform, volcanoes spewing out lava to create new landforms and so on.
