1. The hot molten rock found in the interior of the Earth is called? ?
A. Lava
B. magma
C. pumice
D. cinder
2. Which of the following increases the viscosity of magma?
A. High temperature
C. Low silica content
B. High silica content
D. greater amt. Of dissolved gases
3. What type of volcanic eruption is caused by contact between water and magma?
A. Phreatic B. Phreatomagmatic C. Strombolian
D. Vulcanian
4. What type of volcanic eruption is Mt. Pinatubo?
A. Phreatic
B. Phreatomagmatic C. Strombolian
D. Plinian
5. Which is TRUE about Phreatic/Hydrothermal style of eruption?
A. It is an excessively explosive type of eruption
B. It is a steam driven eruption caused by the contact of hot rocks with water.
C. It is a violent eruption characterized by a fountain lava
D. It is a type of eruption that emits gas​