Third Quarter Science Reviewer

Volcanism does NOT frequently happen:

• at the hotspots

• along the seafloor spreading centers

• convergent boundary where two continental plates collide

• along subduction boundaries where continental and oceanic plates collide

A volcanic eruption can be _____.

• explosive or gentle

• explosive or smooth

• explosive or violent

• explosive or a geyser

The composition of magma is influenced by several factors, such as _____.

• eruption style

• pressure of dissolved gases

• type of volcano it erupts from

• amount of partial melting of the original rock

When a volcano shows no signs of life and exhibits evidence of long-term erosion, it would be classified as a:

• active

• extinct

• dormant

• quiescent

Violent eruptions caused by the introduction of water into superheated magma is called _____.

• lava flow

• phreatic eruption

• caldera collapse

• hot spot volcanism

Which of the following is TRUE about cinder cones?

• Single eruption of cinders made of basalt.

• Multiple eruptions of cinders made of fluid basalt.

• Single eruption of cinders made of viscous granitic-type lava.

• Multiple eruptions of cinders made of viscous granitic-type lava.

The fluid lava flows that make up these volcanoes build up over time in all directions, covering vast distances, and creating domes with wide bases and gentle slopes are known as _____.

• dormant

• composite

• cinder cones

• shield

The higher the viscosity of a magma, the higher its content of _____.

• gases

• nickel

• iron

• silica

A volcanic eruption's style is determined by _____.

• location of the volcano

• steepness of the volcano's slopes

• volcano is dormant

• viscosity of the magma

In some eruptions, mudflows are forced over the _____.

• core

• earth's surface

• mantle

• ocean bed