6.2 Types of Volcanoes

Which TWO factors determine the intensity of a volcanic eruption?

• amount of water vapor and gases trapped in magma

• amount of silica in magma

• location of volcano

• age of volcano

True or False: magma is under LESS pressure as it nears the surface.

• True

• False

A volcano at which type of plate boundary is most likely to contain the highest amount of water vapor in its magma?

• convergent boundary

• divergent boundary

• hot spot

Magma can be classified into two major types based on the amount of __________.

Is this type of lava low or high in silica?

• low

• high

What is this rope-like type of lava flow called?

• silica

• pahoehoe

• aa

• pillow lava

Tags

NGSS.MS-ESS2-1

What type of lava flow is this?

• pahoehoe

• aa

• pillow lava

• silica

Tags

NGSS.MS-ESS2-2

Which of the following is NOT true about pillow lava?

• it forms underwater

• it is the most common type of lava on Earth

• it is silica rich

• it consists of basaltic magma

Tags

NGSS.MS-ESS2-2

What type of magmas produce violent eruptions?

• silica-rich, or granitic magma

• silica-poor, or basaltic magma

What are the 3 major types of volcanoes?

• shield

• cinder cone

• composite

• andesitic