Science 9 assessment

1.What you call the molten rock background?

• A.Crust

• B.Lava

• C. Mantle

• D. Magma

2. What type of volcano is Mount Mayon?

• A.Cinder Cone

• B. Composite

• C.Lava Done

• D. Sheild Cone

3. What type of eruption is the most explosive?

• A.Phreatic

• B.Plinian

• C. Strombolian

• D. Vulcanian

4.What type of volcanic eruptions that is characterized by tall eruption colums with pyroclastic flow and ashfall tephra?

• A.Phreatomagmatic

• B. Plinian

• C.Strombolian

• D.Vulcanian

5.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