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Where are hotspot volcanoes found in the United States?

Most hot spots are located at mid-ocean ridges, but there are a few located in the middle of plates, like Hawaii and Yellowstone. This is a map of the Hawaiian Islands today. They didn’t always look like this. 4.6 million years ago there was only one island in this group.

Where is Yellowstone hotspot?

The Yellowstone hotspot is a volcanic hotspot in the United States responsible for large scale volcanism in Idaho, Montana, Nevada, Oregon, and Wyoming as the North American tectonic plate moved over it. It formed the eastern Snake River Plain through a succession of caldera-forming eruptions.

Is Mt St Helens a hot spot volcano?

St. Helens, include plug-dome elements, the oozing lava staying right above the vent. So, the major volcanoes for our purposes are the quiet, basaltic shield volcanoes of hot spots, the quiet basaltic rift volcanoes of spreading ridges, and the steep, scenic, explosive, andesitic volcanoes of the Ring of Fire.

Where is a hot spot located?

A hot spot is an area on Earth over a mantle plume or an area under the rocky outer layer of Earth, called the crust, where magma is hotter than surrounding magma. The magma plume causes melting and thinning of the rocky crust and widespread volcanic activity.

Why is there a hotspot at Yellowstone?

Beneath Yellowstone National Park in the western United States, lies a hot, upwelling plume of mantle. Heat from the mantle melts the overlying rocks and the resulting magma pools close to Earth’s surface. Areas such as these are known as volcanic hotspots. Occasionally, molten rock from a hotspot will erupt.

Where do hotspots are much more commonly found?

Hotspots are much more common beneath ocean crust. This is because ocean crust is thinner. The plume can more easily penetrate this crust. As the tectonic plates move above a hotspot, they form a chain of volcanoes.

What happens directly above a hot spot?

Hotspots Within Oceans As the tectonic plates move above a hotspot, they form a chain of volcanoes. The islands of Hawaii formed over a hotspot in the middle of the Pacific plate. The volcanoes are massive shield volcanoes that together create the islands.

Can hotspots produce ocean spreading?

When oceanic plates move over hotspots, magma supply is high enough for lavas to pile up faster than plate movement and volcanoes rise up above sea level to create islands. Spreading is usually much faster than the eruption of lavas, so before lavas can pile up to create volcanoes, they are split and spread apart.

What is a hot spot in the ocean?

Summary. Oceanic hotspots are the surface expression of rising mantle plumes from the Earth’s interior and are responsible for much of the intraplate volcanism observed in the ocean basins.

Do hotspots move?

Hotspots are places where plumes of hot, buoyant rock from deep in the Earth’s mantle plow to the surface in the middle of a tectonic plate. They move because of the convection in the mantle that also pushes around the plates above (convection is the same process that happens in boiling water).

What are the differences between a mid ocean ridge and a hot spot?

Mid-ocean ridges and hotspots are major expressions of heat dissipation at Earth’s surface, as evidenced by their abundant volcanic activity. Hotspots, on the other hand, are localized regions of abnormally robust magmatism and distinctive geochemical anomalies (Figure 1).

Why are there so many hotspots at mid-ocean ridges?

As they ascend, some mantle rocks liquefy to form basaltic magmas, or melts, and the buoyant magmas float to the top of the mantle to form oceanic crust. Together, the two hotspots appear to be feeding a huge supply of magma to nearly the entire northern segment of the Mid-Atlantic Ridge.

What two mantle hotspots are located at mid-ocean ridges?

Answer: Iceland, the Azores, and the Galápagos are examples of these “hotspot” islands—so named because they are believed to form above small regions scattered around the earth where unusually hot rocks rise from deep inside the mantle layer.

What hotspot is the Mid Atlantic Ridge closest?

Hotspot–ridge relationships Areas of excess magmatism on the Mid Atlantic Ridge have been called hotspots e.g. the Azores. Gravity field modelling studies have shown that the crustal thickness in this area is 60% greater than normal and the spreading ridge is elevated. The hotspot is asymmetrical (north and south).

Is the crust near a divergent boundary older or younger than the crust farther away from the boundary?

Over millions of years, tectonic plates may move many hundreds of kilometers away from both sides of a divergent plate boundary. Because of this, rocks closest to a boundary are younger than rocks further away on the same plate.