How volcanoes forms at hot spot?

Answer 1

They form in the middle of plates, far from any plate boundaries.

Answer 2

A hot spot forms when extra hot rock rises up from the lower mantle. Some of it melts just beneath the crust, forming magma. This magma then rises through the crust and erupts to form volcanoes.

Answer 3

A new volcano that is forming because of hot-spots is The Big Island in Hawaii. All the other islands were formed by hotspots too, but as the plates haved moved the active volcanos away from the hot-spots. This causes the volcano to become dormant. Many more islands will be formed, while older islands will slip away into the ocean.

Answer 4

Volcanoes form at hotspots and plate boundaries for very specific reasons. Although volcanoes form at both locations, their formation is for very different reasons.

• Hotspot Volcanism: Hotspot volcanoes like the Hawaiian Island chain forms due to an upwelling of magma from the hotspot below. The upwelling is poorly understood, as well as many other aspects of hotspot volcanoes. The magma that occurs from hotspot volcanism is Basalt. Basalt is the least viscous and most fluid of any types of magma. For evidence of this take the Hawaiian volcano Mauna Loa. The broad slopes of the volcano attest to the fluidity of the lava. These broad slopes can only form if a very fluid and hot lava builds up the volcano into the pronounced shield form seen on the Hawaiian Islands.
• Subduction Volcanism: This form of volcanism is what occurs around the pacific ring of fire. These forms of volcanoes are often times very steep sloped and erupt in dramatic explosive fashion. The cause of the volcanism is subduction of one tectonic plate beneath another. This causes melt to occur at a specific depth below the plates. An example of this type of volcano is Mt. St. Helens in Washington. This is part of the Cascadia Volcanic Arc, and represents the Pacific Ring of Fire. This type of volcanism results in the formation of mostly Andesite and Rhyolite. These types of volcanoes build their steep slopes due to the fact that this type of magma resists flowing and will build up a steep cone versus the broad sides that are present in Hawaii.
• Rift Volcanism: Rift volcanism is often times poorly understood and poorly documented. This type of volcanism can be understood through the mid-Atlantic Ridge. The spreading of two plates and infusion of magma are the causes for these types of volcanism. The upwelling of magma under the ocean causes the Atlantic Ocean to spread apart at this point. This is where new crust is generated and allows for the cycle of plate tectonics to take place. These rifts can also occur on land however, for example the rift valley of Africa. These types of magma are Basalt, and often times with the spreading nature do not build volcanoes in the traditional mountain form. It forms in more of a fissure opening and floods out versus building cones like Hawaii or Mt. St. Helens.