Volcanoes

Part of the volcano that is covered by lava.

A long tube that connects the magma chamber to the surface.

When any oceanic plate subducts under another away from the coastline, an Island Arc is formed.

A volcano is a weak point in the crust where molten material can rise to the surface.

Located under the volcano, magma collects here.

We have a quiz on this lesson tomorrow!

I will also be checking your notes tomorrow!

These volcanoes have steeper slopes than shield volcanoes. They can be partially explosive.

These volcanoes have gentle slopes with gradual lava flows. They aren't explosive due to low silica magma.

Explosive eruptions always include pyroclastic flows, a mixture of hot gases, ash, and cinders.

Magma forces itself into rocks and pools there, which later cools.

A volcano is not currently erupting but can become active in the future.

Volcanoes are either erupting or will erupt in the near future.

A volcano that is dead, not likely to erupt ever again

At times, a hot spot in the mantle can burst through the crust at non-boundaries. A volcano will form at that location.

About 450 of all active volcanoes are found in a volcanic belt called the "Ring of Fire".

When magma-heated water is trapped, it will eventually escape as a geyser.

Magma forces itself across rocks horizontally (sideways), which later cools.

There are two major types of eruptions, quiet and explosive, and are based the amount of silica present.

An opening through which magma and gas exit the volcano.

High silica content yields quieter eruptions, low silica content yields explosive eruptions.

Hawaii is an example of a hot spot volcano.

These volcanoes have the steepest slopes of the three. They are the most explosive volcano types.

Lava that reaches the surface is called magma.

Hawaii is an example of an Island Arc

Magma forces itself across rocks vertically (up/down), which later cools.

A bowl-shaped area that can form at the top of the volcano around the central vent.

There are about _______ active volcanoes in the world, and most are near the boundaries of tectonic plates.