What Kind of Volcano is This?

A volcano is a place where lava reaches the surface.

There are three types of volcanoes:

Shield Volcano:A gently-sloped volcano made of

thin, fast-moving lava.

Cinder Cone:A small, steep-sided volcano made of thick Felsic Lava in the form of cinders, ash, and bombs that are violently blown into the air.

Composite:A gentle-then-steep-sided volcano

built of alternating layers of cinders (Felsic) and lava (Mafic).

What kind of volcano is this?

What is your evidence?

Mount Shasta is a composite volcano.

During the last 3,500 years Mount Shasta has erupted about once every 300 years. The most recent eruption probably occurred in 1786.

Your evidence is the size and the gentle-then-steep sides.

What kind of volcano is this?

What is your evidence?

Diamond Head is an eroded Cinder (Tuff) Cone.

Early sailors mistakenly thought glistening calcite crystals inside the tuff rocks were diamonds, leading to the incorrect name.

Your evidence is the small size and the steep sides

What kind of volcano is this?

What is your evidence?

Kohala is a Shield Volcano.

Kohala is the oldest of the volcanoes that make up the Island of Hawaii.

Your evidence is the gently sloping sides.

What kind of volcano is this?

What is your evidence?

In 1991: Avalanches of ash and gas from the summit were followed soon after by lava flows and more ash and steam from the caldera.

Colima is a Composite Volcano.

Your Evidence is the gentle-then-steep sides, and BOTH ash (Felsic) and lava (Mafic) in the eruptions.

What kind of volcano is this?

The Manam Volcano in Papua New Guinea has been erupting since 1974, producing both pyroclastic flows and lava flows.

What is your evidence?

This is a space shuttle shot from space of the Manam Volcano.

Manam Volcano is a Composite Volcano.

Your Evidence is: the type of eruptions: BOTH pyroclastic (cinders, ash, bombs) and lava flows.

What kind of volcano is this?

This volcano formed from highly explosive eruptions, throwing ash, cinders and bombs high into the air.

What is your evidence?

This volcano is a Cinder Cone.

Your Evidence is:explosive eruptions with ash, cinders, and bombs

What kind of volcano is this? What is your evidence?

The volcanic cone is composed of basalt - a Mafic lava. It has been eroded by glaciers over the last 100,000 years.

This is a highly eroded Shield Volcano.

Your Evidence is: the Mafic lava.

Active Volcanoes in the United States.

The End

BONUS: What two states have the most active volcanoes?