science 3

• PHIVOLCS; Philippine Institute of Volcanology and Seismology
• Person who studies volcanoes:Volcanologist
• recorded volcanoes in Philippines:100
• 24 active 76 inacctive
• Volcano: Natural opening of Earth's surface where molte rocks, smoke, and gases are found
• 3 parts of a volcano: Summit, slope, and base
• summit: Part of volcano where we can see the opening
• Summit; there is an opening which may either be called caldera or crater
• Caldera; when the part of the wall of the crater erupts following an explosive eruption
• taal volcano has 47 craters
• magma; molten rocks inside earth
• lava; magma has been ejected out the volcano
• shield volcano


  Broad, slightly doomed structure, like a warrior's shield
• Cinder Cone
• Cinder Cone

  • Steep slope
  • Wide crater
  • most abundant
• Composite Volcano

  • large
  • also known as stratovolcano
  • nearly perfect sloped structure
• crater: it is a funnel-shaped structure at the top of a volcano. Depression in the ground caused by the explosion of a volcano
• enumerate 5 types of volcanic eruptions; phreatic, phreatomagmatic, strombolian, vulcanian, pilinian
• phreatic; stream-driven eruption
• phreatomagmatic; violent eruption between contact of water and magma
• strombolian; periodic weak violent ruption, fountain lava
• vulcanian; tall eruption that can reach up to 20 km high pyroclastic
• pilinian; explosive type of eruption gas and pyroclastics
• silica down viscosity down
• Viscosity is affected by: Temperature, silica content, amount of gases
• when temperature rises siscosity goes down
• is silica content goes down viscosity goes down
• silica: only chemical content of magma
• If the amount of gas rises viscosity also rises
• if viscosity rises it's slow and sticky
• topography: study of mountains
• temperature: degree of hotness and coldness of a place
• wind; movement of air in the atmosphere
• Anemometer: used to determin the speed of the wind, and the direction of the wind.
• Air pressure; it is the force caused by the weight of the air in the sky
• Barometer: used to measure the force of the wind
• humidity: amount of water vapor in the air
• precipitation: the water falling from the atmosphere in the form of rain, snow or hail
• Rain Gauge: A device used to measure the amount of rain that falls on a given area.
• climate: general pattern of weather in a certain area over a long period of time