Sci9_Q3_Mod1_Types of Volcanoes and Volcanic Eruptions_Version3.pptx

presentation, junior high school

1. PART 1

2. 1. What is a volcano? A. The movement of the plate boundaries on the Earth’s crust. B. A mountain created by the faulting and folding of the Earth’s crust. C. An opening in the Earth’s crust through which lava, ash, and gases escape onto the surface. D. A landform which has a summit but without a crater

3. 2. What is a volcanic eruption? A. It is a sudden violent shaking of the ground, causing great destruction. B. It is an event that happens when hot lava, ash and gases are discharged from a volcanic vent. C. It happens when the plate edges of the Earth’s crust move downward or sideways. D. It is a region deep within the Earth’s mantle from which heat rises.

4. 3. The following are factors affecting the viscosity of the magma, EXCEPT: A. Amount of dissolved gases contained in magma B. Chemical composition of magma C. Size of the volcano’s crater D. Temperature of magma

5. 5. Which type of volcanoes have broad bases and steep sides, usually have a large crater at the top and are formed by alternating layers of magma and ash? A. cinder cones B. shield volcanoes C. composite volcanoes D. calderas

6. 6. Taal Volcano in Batangas is an example of ______. A. cinder cone B. composite volcano C. shield volcano D. lava spire

7. 7. Mt. Mayon is an example of a volcano because. A. cinder cone, it is formed exclusively of pyroclastic materials B. composite, it is composed of alternating layers of pyroclastic fragments and solidified lava flows C. shield, it is constructed of solidified lava flows D. caldera, it was created when the summit was blown off by exploding gases

8. 10. Mount Pinatubo erupted last April 2, 1991. What kind of volcanic eruption was it? A. plinian B. phreatic C. strombolian D. vulcanian

9. PART 2

10. PART 3

11. PART 4

12. PART 5 1. What is a volcano? 2. What is a volcanic eruption? 3. What materials oozes out when a volcano erupts?