science 9 assessmanet

1. What do you call the molten rock background?

• a. crust

• b. lava

• c. mantle

• d. magma

2. Why is it important to determine the viscosity of magma?

• a. to learn its composition

• b. to gives us signal its eruption

• c. to measure other factors

• d. to determines its explosiveness

4. What type of volcanic eruptions that is characterized by tall eruption column

with pyroclastic flow and ashfall tephra?

• a. phreatomagmatic

• b. plinian

• c. strombolian

• d. vulcanian

3. What type of eruption is the most explosive?

• a. phreatic

• b. plinian

• c. strombolian

• d. vulcanian

2. What type of volcano is Mount mayon?

• a. cinder cone

• b. composite

• c. lava dome

• d. shield cone