Volcanoes

1. Describe the 3 components of magma. __GiVe some detail about each.

2. What does silicate mean?

3. What does it mean when silicates polymerize?

4. What is the most important gas in magma? What is the second most important gas in
magma? (the greenhouse gas)

5. Complete the following table from the Volcano notes. (Note on test rhyolite and basalt may be reversed
their position.)

basalt andesite rhyolite

Silica
Temperature
Dissolved gases
Viscosity
Define viscosity:

6. What are 2 locations on a volcano Where lava can erupt from?

7. Why do volcanic rocks have a “fine texture” which means that the individual mineral grains are not
usually visible without a microscope? (Hint: where does lava cool?)

8. What does pyroclastic mean?

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