Science

• Earthquake - Violent shaking of the ground, sometimes causing great destruction, as a result of movements within the Earth's crust or volcanic action. Earthquakes are accordingly measured with a seismometer, commonly known as seismograph.
• Fault - is the break in the Earth's crust, along the break, significant moment has taken place.
• Focus - Origin of Earthquakes. It is where the earthquake begins.
• Epicenter - The area directly above the focus. The total amount of energy released by an earthquake is called Magnitude measured by Ritcher Scale.
• The degree of destruction caused by an earthquake is intensity determined by Mercalli Scale.
• A volcano is a crack in the surface of the Earth that allows extremely hot lava, steam, and ash to escape and ejected onto the surface during eruptions.
• Volcanic Eruption

  An eruption begins when pressure on the magma chamber forces magma up through the conduit and out the volcano's vent.
• Magma - Molten rocks found in the mantle. When it is ejected or goes out from the volcano, and reaches the ground, it is named as lava.
• Lava - Molten rock that flows on the surface of a volcano.
• Kinds of Earthquake

  Tectonic Earthquake - When two tectonic plates move suddenly against each other, an earthquake occurs.

  • Convergent plate boundaries - occur where tectonic plates collide.
  • Divergent plate boundary - occurs when two plates move a part from eachother.
  • Transform plate boundary - occur when two plates slide past one another.
• Volcanic Earthquakes - Occur in areas that are associated with volcanic activities, such as Mt. Pinatubo in Zambales and Mt. Taal in Batangas.