Presentation on theme: "Volcanic EruptionVolcanic Eruption Jessica 8BJessica 8B What happens during volcanic eruptions: Simple eruption Zoom in Molten rock Smoke Explanation."— Presentation transcript:
Volcanic EruptionVolcanic Eruption Jessica 8BJessica 8B What happens during volcanic eruptions: Simple eruption Zoom in Molten rock Smoke Explanation End Credits
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What happens during volcanic eruptions: Simple eruption Zoom in/lava Molten rock Smoke Choose any of the following for an explanation. The words underlined red like this are important keywords. The Explanation page buttons are not always on the bottom right corner of the page. When it glows the explanation is over FAQ Lava
Volcanoes can be dormant, extinct, or active. We are here to look at active volcanoes. How are we supposed to look in a volcano from here? Lucky for you it’s almost MY birthday ! Which calls for… Cake knife! CENSORED NO VOLCANOES WERE HURT DURING THE MAKING OF THIS PRESENTATION… That’s better. We did not get frosting stuck on the screen right? GOOD! Down there is magma. BUT it will no longer be called magma after… Good to go! STOP! When the magma is out of the volcano it is called lava. There are different types of lava. We’re here to look at Pahoehoe lava. It’s pronounced pa-hoy-hoy. Pahoehoe is runny lava Like this: Ooo! Let’s look underground … Here are the parts of a volcano eruption… Here’s the Mantle. Mantle This is where the magma chamber is. Magma chamber Earth’s crust This part is the Earth’s crust. Red-hot magma This is where the red hot magma gets out. How does the magma get out? This question can be answered with the IMAGINATION! Let’s say this balloon is the Earth’s crust. Inside the Earth’s crust is the magma chamber as shown before. And let’s say something happened to the earth’s crust… Something AMAZING! Something like…THIS! EVERYTHING GOES… BOOM! In other words if there is a crack in the earth’s crust the magma escapes. You can go back to the explanation page now.
I’m sure you’ve seen lava in lot’s of video games… Well I guess I wouldn’t have to tell you that lava is RED HOT, LIKE CHILI SAUCE! Although there are types of lava. Like Pahoehoe, It’s pronounced Pa-hoy-hoy. Aa, It’s pronounced Ah-ah. Pillow lava, Pronounced well Pillow lava You can make CRYSTALS and GEMS out of minerals in lava too! Normally I would tell you about each type of lava from beginning to end… But I can see the girls are all wondering about the diamonds. So I’ll tell about crystals and gems first. So let’s zoom in. Closer… Can you see me? OK! CRYSTAL and GEMS When molten lava cools, the minerals inside slowly turn into… CRYSTALS! Some can be rare and precious… These can be cut and polished into gems. You can find other things like… Agate: Formed in a bubble inside magma Zeolite: A glassy crystal of oxygen, silicon and various types of metals. Olivine: Shiny stone containing iron & magnesium This is what cut olivine looks like: A simple uncut diamond in volcanic rock from the mantle. It looks boring when uncut but when cut… IT MAKES GREAT DECORATION! To see the next type of lava we have to go underwater You might have already know about those. Earth’s Crust Mantle Red-hot Magma Magma chamber If you don’t you could always go back to the explanation page. And click on simple eruption. Anyway… We’re here to see Pillow Lava Somewhere close to the volcano is more mantle Some bubbles of magma float up and erupt through the ocean’s crust! See what happened? When magma wells up under the sea, It cools and forms into large bubbles of lava It’s called pillow lava because they look like stone pillows! Back to land! Now let’s talk about Aa lava. Jagged and crumbly, Aa lava is formed when the molten rock cools down on contact with air. Although Pahoehoe is very runny When it cools it looks like wrinkled skin. Or coils of rope! You can go back to the explanation page now.
Ever wondered how Olympus Mons became the largest volcano ever seen by humans? Well… Let’s spot Mars to see what Olympus Mons looked like years ago… Closer Can you see me? Good! It’s time to see some volcanic action! When the lava cools… It hardens. New layers are formed… Olympus Mons is now extinct. It means well, dead. In other words it will never erupt again. This is not the same with dormant. Dormant means it will erupt again after a while. Although Olympus Mons is dead now… Well let’s just say LIFE’S HUGE WHILE IT LASTED! It is now 3 times larger than mount Everest. Sometimes it takes to about a year for a volcano to grow from small to big You can go back to the explanation page now.
Clouds of ash and dust from volcanoes are dangerous. Here’s a preview… Let’s stand in a volcano! Can you see me? Volcanologists use protective suits like this so they can study volcanoes. When volcanoes erupt ashes and dust come out! In a beautiful moment like this, all I can say is… THAT WAS NOT ME!!! Anyway… These clouds can sometimes stay in the sky for so long it looks black! In fact when Mount Pinatubo erupted in 1991, it threw out HUGE amounts of Ash, dust and dangerous gases down the volcano! Dust and ash turned the sky black. When the dust fell on land, everything fell on the trees, houses and other things everything goes… BLACK! It causes stuff like starvation, darkness and GREYHEADEDNESS. You can go back to the explanation page now.
End Credits Created By: Jessica Wibowo Class: 8B Lesson: Information Technology (IT) Teacher: P.Hendarto Created on Microsoft PowerPoint 2007 Simple explosion Created on Wednesday 15 August 2007 Zoom in Created on Wednesday 15 August 2007 Molten rock Created on Wednesday 15 August 2007 Smoke Created on Sunday 19 August 2007 Explanations Source: My Best Book of Volcanoes by Simon Adams, published on 2007 Simple explosion Created on Wednesday 22 August 2007 Zoom in Created on Saturday 25 August 2007 Molten rock Created on Sunday 26 August 2007 Smoke Created on Sunday 26 August 2007 Finished on Monday 27 August 2007 This presentation would not be possible without the inspiration of real life volcanoes… No volcanoes were harmed in the making of this presentation… WAIT! Just wanted to say… Good night folks! End of slide show, click to exit.