Types of Volcano and Volcanic Eruption | Grade 9 Science| Quarter 3 Week 1 Lesson

good day students it's been a long time welcome back to my strong techie youtube channel first of all i would like to congratulate everyone because we are now halfway completing grade 9 science we are now in quarter 3 which is about earth science good job class for making it here our first lesson for this quarter is about the different types of volcano this is our learning objective describe the different types of volcanoes and volcanic eruption so listen carefully and keep on watching [Music] before we start let us have some unlocking of difficulties let us define some terms that you will encounter let us define what volcano is volcanoes are natural opening in the earth's surface where molten rocks smoke gases and ashes are ejected have you seen my own volcano located in albay be called philippines vid you know that mayon volcano is one of the world's most active volcanoes and it is very popular because of its perfect cone volcano has three basic parts namely the base the slope and the summit where the crater or opening is located speaking of crater crater is a funnel shaped depression at the top of a volcano formed as a result of explosive eruption it is the mouth or the opening of the volcano do you know this volcano this is the volcano located in batangas philippines this volcano has many creators not just one two or three but 47 craters amazing right it is a volcanic crater that is formed when a part of the wall of the crater collapses following an explosive eruption a caldera collapse is usually triggered by the emptying of the magma chamber beneath the volcano as the result of a large volcanic eruption when we say magma it is a hot fluid or semi-fluid material below or within earth's crust that is usually made from molten rocks when the magma ejected out of a volcano it is now called lava when the magma is ejected out of a volcano it is now called lava lava is an italian word which means to slide which is what molten rocks does once it reaches the surface now let us proceed to the different types of volcano volcanoes can be classified according to its shape and according to its eruption let us have first the types of volcano according to its shape the first type is shield volcano this is formed by the accumulation of lava oozes out from the volcano since non-viscous lava can flow freely broad slightly doomed structure that resembles warriors shield is formed that is why it is called shield volcano because it looks like a warrior's shield example is mauna loa in hawaii the second type is what we call cinder cone volcano this is built from adjective lava fragments they have steep slope wide crater and is most abundant of the three major volcanoes it is also known as scoria cone example is mount per cutting in mexico as you can see it has a steep slope and has a wide crater with our characteristics of a cinder cone volcano lastly we have composite volcano it is also known as stratovolcano this is large nearly perfect slope structure formed from the alternate solidification of both lava and pyroclastic deposits according to volcanologists or the people who study about volcanoes some of the earth's grandest mountains are composite or stratovolcanoes one good example is our very own mayon volcano and those are the three types of volcano according to its shape again we have shield volcano that is broad and resembles a warrior's shield cinder cone volcano also known as scoriacone and has wide craters composite volcano or also known as stratovolcano with nearly perfect slope structure but why do volcanoes have different types it is because the process of magma formation is different at each type of plate boundary therefore the composition of magma differs in each tectonic setting now let us have a short activity let us identify the following volcanoes a shield volcano cinder cone volcano and composite volcano let us start this is mount saint helens in southwestern part of washington state and this is an example of ride class cinder cone volcano let's have this beautiful mount fuji in japan what do you think is this type of volcano this is composite volcano very good class next we have mauna kea in hawaii this is an example of shield volcano good job class now let us go to the different types of volcanic eruption or the types of volcano according to its eruption the first one is phreatic it is a stream-driven eruption as the hot rocks come in contact with water it is also known as hydro thermal phratic eruption is the type of eruption that happens to ta'al volcano last january 12 2020. next we have freyato magmatic it is a violent eruption due to the contact between water and magma unlike phryatic that happens because hot rocks come in contact with water freyato magmatic eruption happens if there is an interaction between water and magma resulting to a violent fine ash eruption the third is strombolian it is a period weak to violent eruption characterized by fountain lava as shown in your screen right now it is a fountain lava the fourth one is what we call volcanion it is characterized by tall eruptions that reach up to 20 kilometer high with pyroclastic flow and asphalt tephra again it is characterized as tall eruption lastly we have blinion it is excessively explosive type of eruption of gas and pyroclastics it is intensely violent kind of eruption that happens to mount pinatubo year 1991. again the five types of volcanic eruption are phratic or the stream-driven eruption that happens between the contact of hot trucks and water freyato magmatic that happens between the interaction of magma and water resulting to a violet fine ash eruption strombolian eruption or characterized as fountain lava vulcanian or characterized as tall eruption and plinyan as the most excessively explosive eruption [Music] moreover we can also classify volcanoes according to its record of eruption active volcano a volcano is active if it has a record of eruption on the other side a volcano is inactive if it shows no activity and no record of eruption just like mount kanlaon in negros occidental philippines we are going to discuss more about this on our next video to end our lesson we can thank volcanoes for life on earth to put simply volcanoes keep the earth warm and wet which are two critical elements for sustaining life thank you so much for watching i hope you learned something new again we will continue this lesson on my next video so please do subscribe like share and click the bell button bye class [Music] you

Channel: Maestrang Techy

Views: 491,377

Keywords: Grade 9 Science, Earth Science, What is volcano, Types of Volcanic Eruption, Deped MELC-based lesson, Shield volcano, Cinder cone volcano, Composite volcano, Phreatic eruption, Introduction about volcano, Week 1 lesson, 3rd Quarter Science, Module in Science

Id: I1gCzKglilI

Length: 10min 1sec (601 seconds)

Published: Sun Mar 21 2021