Types of Volcanoes and Eruptions

Question 1

built from ejected lava fragments, steep slope and wide crater. most abundant. 100-400m high

Answer 1

Cinder cone

Question 2

formed by the accumulation of lava. Non-viscous lava. Quiet eruptions

Answer 2

Shield

Question 3

formed from alternate solidification of both lava and pyroclastic deposits. 8000 ft above their bases

Answer 3

Composite Volcano

Question 4

relatively small, circular mounds because of viscous lava

Answer 4

Lava Dome

Question 5

a violent eruption. Lava goes up into the air, magma is highly viscous. Composed of lava, pyroclastic material and rocks.

Answer 5

Explosive Eruption

Question 6

a silent eruption. Lava flows, magma is less viscous. Composed mainly of lava only. most common

Answer 6

Non Explosive Eruption

Question 7

less viscous means?

Answer 7

thin, shorter time

Question 8

more viscous means?

Answer 8

thick, longer time

Question 9

Primary Factors affecting Eruption Style (M.M.A.)

Answer 9

Magma’s Temperature
Magma’s Chemical Composition
Amount of Dissolved Gases

Question 10

The higher the temperature. The _ the viscosity

Answer 10

less

Question 11

the higher the silica content, the _ the viscosity

Answer 11

higher/more

Question 12

the higher the amt of dissolved gases, the _ the viscosity

Answer 12

lower/less