Volcanoes

• It is an opening, gap or crack on the earth's surface.


  Volcano
• Melted rocks that comes from the earth's surface


  Magma
• Magma that reaches the earth's surface

  Lava
• Three Main types of volcanoes

  Shield

  Cinder-cone

  Composite
• These are formed from non-explosive eruptions. They have broad base and gently sloping sides

  Shield Volcanoes
• Largest shield volcano in the world

  Mauna Loa in Hawaii
• Have narrow base and steep sides.


  Cinder cone volcanoes
• Hardened pieces of lava

  Cinders
• A large cone-shaped mountain built by alternating layers of lava.

  Composite Volcanoes
• How many active volcanoes in the philippines

  23
• These are volcanoes that have erupted within the last 600 years

  Active Volcanoes
• How many potentially active volcanoes are there in the philippines

  26
• How many inactive volcanoes are there in the philippines

  300+
• What does PHIVOLCS mean


  Philippine Institute of Volcanology and Seismology
• Three categories of volcanoes

  Active

  Inactive

  Potentially Active
• These are volcanoes that have erupted within the last 600 years

  Active Volcanoes
• How many active volcanoes are there in the Philippines

  23
• How many potentially active volcanoes are there in the philippines

  26
• These volcanoes look young based on their structure and form and show no sign of historical records of eruption

  POtentially Active Volcanoes
• When did the Mayon Volcano erupted

  February 1, 1814
• An active volcano in Naples, Itlay

  Mt. Vesuvius
• A volcano in Indonesia that erupted in 1883 that the explosion was comparable to 3,000 times the power of an atomic bomb.


  A volcano on the island of Krakatoa, Indonesia
• The largest volcanic eruption recorded in history


  Mt. Tambora in Indonesia
• World's largest volcano


  Mauna Loa, Hawaii
• A dormant volcano in the Philippines for six centuries

  Mt. Pinatubo
• What are the chief precursors of volcanic eruptions?

  Heat and pressure
• These type of lava is rich in magnesium and iron and contains a lot of water.


  Dark-colored lava
• When a dark-colored lava cools down, it turns into?

  Basalt
• Contains less water and rich in aluminum and silicon.


  Light-colored lava
• Light-colored lava turns into?

  Rhyolite
• Third type of lava contains composition similar to

  light and dark-colored lava
• The fourth type of lava contains large amounts of ____ and ___.

  steam and carbon dioxide
• When the fourth type of lava hardens, it turns into?

  Pumice

  Scorcia
• Different rock fragments that are thrown into the air during a volcanic eruption

  Volcanic dusts and ashes
• These are the smallest particles, as tiny as the grains of rice.

  Volcanic Dusts
• Tiny as the grains of flour

  Volcanic Ash
• Large rock particles


  Volcanic Bombs
• Small volcanic bombs


  Cinders
• Gases that are given off during volcanic eruptions

  Volcanic Gases
• Materials from volcanic eruption


  Lava

  Volcanic dusts and ashes

  Volcanic Bombs

  Volcanic Gases