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all right good morning this is your science for moving to the next lesson in the chapter and it is on volcanoes another way we can have fast changes on Earth's surface you need to have your own book in front of you because I know the video is not great quality assessor for seeing the pictures in the diagram but I will read it and you can follow along in your own Trump needs to 6262 it says main idea that into changes to earth's surface can be caused by volcanoes what is a volcano volcano is a mountain that builds up opening in Earth's crust sometimes melted rock gases and pieces of rock are forced out of out of a volcano this is called an eruption a volcanic eruption can cause land did you ever shake a can of soda and then open it the gas is inside the soda explode in a spray when somebody knows erupt something similar happened come to the surface when gas escapes easily there is a gentle eruption when trapped gas is build up pressure and magma this is the kind of eruption that happened in May of 1980 and if you look at the picture down here. Helens before eruption it blue giant crater into the mountains picture showing you the magma chamber where the magma is inside the earth and then it travels up eventually erupting out we call it magma when it's inside and lava wants that hot melted rock. underground is called magma on the surface is called lava but both of those are melted rock the vents of the opening where would slow Rising magma you know that magma is found deep Earth's surface through a central opening in a volcano is called Earth's surface it is called lava from the volcano slowly another time that leads the volcano in explosion Lowe's over Earth cools and hardens what time it causes a mountain to form volcano formed by the lava flow and asked deposits that built up around it where do volcanoes form volcanoes occur along Spa where Earth where Earth's plates move together one plate put the needs another the plate moving down melt change the magma like heated air or water magma rises and Rises up through Earth's crust to form volcanoes volcanoes also form where Earth's plates are moving apart they form along place a call to Rick Pino most rich volcanoes form along the ocean floor so volcanoes can happen at two kinds of piece of land one of the pieces of land usually because it's made of something that has a heavier material will sink below the other and what happens as it's sinking below and it's getting hotter and hotter cuz it's getting down to the inner part of the Earth melted magma It's Hot and Hot things will rise above us and that is one place where you can have a volcano accuplacer actually pulling apart some of that magma to rise up through the opening and a volcano hotspot sometimes volcanoes form where plates do not eat Hawaiian Islands Volcano Island volcanic island formed in the middle of a place over a hot spot a hot spot is a place where magma partially melts Earth crust as a plate moves over a hotspot magma rises forming a volcano look at the map of the Hawaiian Islands there is chain of islands as the plate moved over the hotspot Island was formed slowly over time as it moves whenever that crossword about the hot spot in Island would form the island the further away they are from the Hawaii is the youngest Island it is still forming over the hotspot this means that the volcano is still erupting the island of Hawaii is the oldest island it is a dormant volcano volcano no longer erupts no longer USA volcanoes what are some kinds of volcanoes not all volcanoes are the same difference between depends on the kind of lava that erupts from the diagrams on these Pages show some kinds of volcanoes a cinder cone volcano it has steep sides the magnet in this kind of salty never said a lot of gas is trapped in the micro because it can become clogged pressure buildup from the gases who's finally explodes out of the magma lava burst into the air is Sullivan pieces around the vent a cup like spit cup like state farms around the volcano all the Creator cinder cone volcano is found in Lassen Peak volcanic Lassen Volcanic National Park in North Eastern California this is a cinder cone diagram so keep that in mind cuz later this week you're going to be drawing the three different diagrams of the three types and you're going to use your book in your own trying but with the same label. another type of volcano is Kilauea volcano a shield volcano has sides that are wide and flat it is formed by layers of lava that build up over time play Flow from one or more opening the Hawaiian Islands are an example of shield volcanoes composite composite volcano is made up of and it's warm during periods of quiet eruptions and explosive eruptions the eruptions team to take turns and wrap them maybe it's maybe explosive one time have a quiet. overtime the layers build up to this kind of volcano is usually symmetric that means the shape on one side of the reminders are three diagrams of the three different singer Colin composite how can you be safe around volcanoes in the past scientists did not always know when a volcano is going to erupt today does to predict eruptions active volcano sites and lava flow available for each member of your family in your emergency supply kit if your town has a warning system follow all instructions leave the area of where long sleeve shirt if you are indoors near an erupting volcano close all windows and doors make sure your pets are inside if you are caught outdoors find the nearest shelter and stay inside you are going to be doing a kind of work with this lesson instead of the regular vocab pages and close test drawing those three diagram to see it later in the week because this is the last we're going to study together you don't need to do it this week but anybody who wants the kind of research Pompeii Google Pompeii and see what you can learn about it and then send me some facts until we'll stay until May 29th if you want to do that totally extra optional work you don't have to do it but if you're interested in volcanoes research Pompeii and see what you can learn

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