Volcanoes

VOLCANOES

A. Definition

1.Volcano – is an opening (or rupture) in the surface or crust of Earth which allows hot, molten rock, ash and gases to escape from deep below the surface.

Ring of Fire

A. Definition

2. Ring of Fire – is the region where more than half of the active volcanoes of the world that are above sea level are located or found.

B. How Volcanoes are Formed

1. When Plates collide, a volcano is formed


2. When Plates spread apart, a volcano is formed


3. Volcanoes are formed in the middle of a Plate

C. Parts of a Volcano

Crater

Pipe

Cone

Vent

D. Kinds of Volcanoes

Mayon Volcano


1. Composite/Strato Volcanoes are formed by alternating layers of lava and

rock fragments erupt in an explosive way


Mauna Loa


2. Shield Volcanoes are among the biggest volcanoes are made of many layers of runny lava flows low-explosivity


Paricutin Volcano


3. Cinder Cone Volcanoes are made of lava fragments called cinders low-explosivity

E. Categories of Volcanoes

if it has erupted recently or about 10 000 years ago

• Also called Dormant

• If it rarely has a record of previous eruption

Active Inactive

F. Kinds of Volcanic Eruptions

VIDEO


1. Eruptive Pulse an explosion with eruption plume may last from a few seconds to

minutes


2. Eruptive Phase numerous eruptions that may

alternate between plume and lava surges

may last from a few hours to days


3. Eruptive Episode is composed of several phases

that may last a few days, months or years

G. Beneficial and harmful Effects of Volcanic Eruptions

1. Attracts tourists and visitors


2. Adds nutrients to the soil


3. Creation of new islands


4. Release of aerosols


5. Acid rain


6. Abandoning of land and homes

Directions: Classify the effects of Volcanic eruptions as Beneficial or Harmful. Put the effects in their corresponding column.

Beneficial Harmful

Directions: Answer the following questions.

1. What is a volcano?2-4.How are volcanoes formed?5-8. What are the parts of a volcano?9-10. What are the categories of Volcanoes?

11-13. What are the classifications of Volcanoes?14. Give 1 beneficial effect of Volcanic eruptions15. Give 1 harmful effect of Volcanic eruptions

2-19-13AssignmentDirections: On a ½ crosswise, write in five to six sentences the effects of volcanic eruptions. Pass it next meeting, February 20, 2013, Wednesday.

Volcanoes

Education

Transcript of Volcanoes