You asked: Why are volcanoes such a common feature of the African rift?

Rift volcanoes in continental locations such as the East African Rift System are more complex. … Assimilation of continental crust apparently gives them some of the characteristics more generally associated with subduction volcanoes, such as having a wider range of rock types and explosive habits.

Why are volcanoes common at the East African Rift?

A new spreading centre may be developing under Africa along the East African Rift Zone. When the continental crust stretches beyond its limits, tension cracks begin to appear on the Earth’s surface. Magma rises and squeezes through the widening cracks, sometimes to erupt and form volcanoes.

Do volcanoes occur at rift valleys?

The most well-known rift valley on Earth is probably the so-called “Great Rift Valley System” which stretches from the Middle East in the north to Mozambique in the south. The area is geologically active, and features volcanoes, hot springs, geysers, and frequent earthquakes.

Why does volcanic activity often accompany rifting?

But why are the rift zones so active? Rift zones are areas of weakness in the volcano which form early in its lifetime, likely due to spreading of the volcano as it settles. This linear area that is being rifted, or pulled apart, remains active through most of the volcano’s building stages.

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What type of volcano is a rift volcano?

…explosive and build stratovolcanoes, while rift volcanoes tend to be more effusive and build shield volcanoes, though there are exceptions to both these generalities. Subduction-related volcanoes erupt basalt, andesite, dacite, and rhyolite, andesite being the predominant rock type.

Do we have volcano in South Africa?

Background. Marion Island, South Africa’s only historically active volcano, lies at the SW end of a submarine plateau immediately south of the SW Indian Ocean Ridge, opposite Prince Edward Island. … The 1230-m-high island is dotted by about 150 cinder cones, smaller scoria cones, and coastal tuff cones.

What is the biggest volcano in Africa?

Mount Kilimanjaro is a dormant volcano in Tanzania. It is the highest mountain in Africa with an elevation of 19,341 feet.

How is Rift Valley formed?

A rift valley is a lowland region that forms where Earth’s tectonic plates move apart, or rift. Rift valleys are found both on land and at the bottom of the ocean, where they are created by the process of seafloor spreading. … Tectonic plates are huge, rocky slabs of Earth’s lithosphere—its crust and upper mantle.

Where are rift volcanoes located?

Rift volcanoes form when magma rises into the gap between diverging plates. They thus occur at or near actual plate boundaries.

Where do rift eruptions most often occur?

Because most rifts are part of mid-ocean ridges, most volcanic eruptions at rifts occur underwater. The mid-Atlantic ridge — a divergent plate boundary separating the plates on which Europe and Africa lie from the plates on which the Americas lie — is one of the Earth’s primary locations for rift eruptions.

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What causes rifting?

Continental Rift: Topography, Earthquakes, and Volcanism

Ripping a tectonic plate apart elevates the region and causes earthquakes, volcanic eruptions and the formation of long mountain ranges separated by broad valleys (basins).

Do Transform boundaries cause volcanoes?

Volcanoes do not typically occur at transform boundaries. One of the reasons for this is that there is little or no magma available at the plate boundary. There are three settings where volcanoes typically form: constructive plate boundaries.

What is the difference between magma and lava?

Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth’s surface.

What is the hole of a volcano called?

A volcanic crater is an approximately circular depression in the ground caused by volcanic activity.

Are rift zones?

A rift zone is a feature of some volcanoes, especially shield volcanoes, in which a set of linear cracks (or rifts) develops in a volcanic edifice, typically forming into two or three well-defined regions along the flanks of the vent.

How are vent and Rift different?

Pyroclastic material is mostly ash and solid rock that is blasted into the air during an explosive volcanic eruption. Explain the difference between a vent and a rift. A vent is a spot in Earth’s surface through which lava or pyroclastic material passes. … A shield volcano forms when lava spreads out over large areas.

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