2. Which of the following factors associated with huge volcanic eruptions may cause the decrease in the Earth's average temperature for a few years?
a heat
b. light
c. acid rain
d. volcanic ash
4. What provides the force that causes the magma to erupt to the surface?
a. the silica in the magma
b. dissolved gases trapped in the magma
c. gravity in the lithosphere
d. the density of the magma
5. When an explosive eruption forms a mixture of hot rock, ash, and gas, this material is called a ...
a. Land slide
b. Lava
c. Eruption trail
d. Pyroclastic flow
6. What is the principal ingredient to all types of magma?
a. Iron
b. magnesium
c. silica
d. water
7. The composition of magma determines its
a. viscosity
b. darkness
c. color
d. temperature
8. As the temperature of the lava increases,
a. Its viscosity decreases c. its viscosity increases
b. It begins to harden
c. its viscosity increases
d. it can flow a much distance
9. Very explosive volcanoes tend to have
a. Low viscosity magma
b. Gases rich in sulfur dioxide
c. Gentle, sloping sides
d. High viscosity magma
10. Which of the following is NOT a factor that determines how violent a volcano will erupt?
a. Temperature of the magma
b. Composition of the magma
c. Dissolved gas amount in the magma
d. color of the magma
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Answer:
2.D
4.B
5.B
6.C
7.A
8.A or C
9.B
10.D
Explanation:
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