Science 6 PPT Forces Affecting Earth (Volcanic Eruptions) PDF

SCIENCE 6 MS. ROEVIL TABORADA GUESS THE PICTURES! + + GUESS THE PICTURES! + + VOL + CAN + NO Volcanoes and the Different Volcanic Activities LEARNING OBJECTIVES: Describe the changes on the Earth’s surface as a result of earthquakes and volcanic eruptions; Describe the different types of volcanoes;...

SCIENCE 6 MS. ROEVIL TABORADA GUESS THE PICTURES! + + GUESS THE PICTURES! + + VOL + CAN + NO Volcanoes and the Different Volcanic Activities LEARNING OBJECTIVES: Describe the changes on the Earth’s surface as a result of earthquakes and volcanic eruptions; Describe the different types of volcanoes; and Enumerate ways what to do before, during and after the volcanic eruption. Volcanoes and the Different Volcanic Activities Volcanoes are vents in the crust of the earth by which usually molten rocks and steam eject. It is an opening in the earth’s crust. Kinds of Volcanoes A. According to Shape and Composition of the Cone Shield Volcano has a wide base with gentle sloping sides. The cone is made up purely of lava that poured out and solidified during mild or quiet eruption. A. According to Shape and Composition of the Cone Cinder cone volcano is built almost entirely of loose fragments called cinders. It is formed by explosive eruptions. It has bowl-shaped craters at the summit. A. According to Shape and Composition of the Cone Composite Volcano or Stratovolcano are composed of alternating layers of lava and cinders are formed when volcanic eruptions vary among quite, violent, or explosive eruption B. According to Activity Active Volcano is considered active if it is currently erupting or showing regular signs of activity like earthquake activities and significant gas emissions. An active volcano has a record of eruption within 50 years. B. According to Activity Dormant Volcano has currently erupted and then entered a long period of inactivity. Dormant volcanoes that have not erupted for decades or centuries may cause greatest volcanic threat. Mt. Pinatubo is an example of dormant volcano. B. According to Activity Extinct Volcano Are volcanoes that have not shown sign of activity for a long period of time. It has no record of volcanic eruption in the past thousand years. Volcanic Eruptions An eruption begins when pressure on the magma chamber forces magma up through the conduit and out the volcano vents. Types of Volcanic Eruption Explosive or Violent Eruption During explosive eruptions, the lava ejected is torn into shreds, forming pieces of pyroclastic material called tephra. Quiet Non-Explosive Eruption Basaltic magma has relatively low silica content. It is less viscous and gases can escape readily. Benefits of Volcanic Eruption Agricultural Benefits The greatest resource from volcanic eruption is the land formed by the erupted materials. After a volcanic eruption, the burning lava can turn into one of the richest or most fertile soil in the world. Benefits of Volcanic Eruption Energy and Industrial Benefits Geothermal energy serves as an alternative source of electricity. It utilizes heat beneath the earth’s surface to create energy. Dangers of Volcanic Eruption Effects of Volcanic Gases Ash like sulfur dioxide, nitrous oxide, and hydrochloric fumes can lead acid precipitation. Dangers of Volcanic Eruption Effects of lava and pyroclastic flows Lava destroys anything in its path. Huge volumes of lava flow can cause massive destruction. LET US APPLY! As a group, create a short role-play of the different safety precautions before, during, and after a volcanic eruption. LET US MAKE MEANING! Knowing that Philippines is prone to disasters why is it important to prepare and be knowledgeable before the occurrence of a disaster? In what ways can you prepare for a volcanic eruption? Generalization: Share a phrase about what you have learned from today’s discussion.