Lecture 13

Question 1

Magma can be mafic, intermediate, or felsic.

Answer 1

True

Question 2

What characteristics influence the behaviour of magma?

Answer 2

The amount of silica, the temperature, the amount of dissolved gas

Question 3

What are traits of mafic/basaltic lava?

Answer 3

Flows easily, low viscosity, low silica content, low gas content.

Question 4

What are traits for intermediate/andesitic lava?

Answer 4

Erupts explosively, high viscosity, high silica content, high gas content

Question 5

What are traits of felsic/rhyolitic lava?

Answer 5

Erupts catastrophically, most viscous, high silica content, highest gas content

Question 6

What are the two types of volcanic eruptions?

Answer 6

Effusive and explosive

Question 7

What’s an effusive explosion?

Answer 7

Rough slow lava

Question 8

What’s explosive volcanic eruption

Answer 8

More viscous, releases gases, fast moving

Question 9

What are the two main divisions of volcanoes

Answer 9

Central vent volcanoes and large scale volcanic terranes