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Volcano Prezi

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by

Sarah Mangus

on 8 May 2013

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Transcript of Volcano Prezi

What is a volcano? A volcano is a mountain that forms as lava flows through a crack onto Earth's surface. What causes volcanoes to form? As you saw in the video, Earth's plates are constantly changing position. This is known as plate tectonics. Let's discuss some of the ways plates move. What effects do volcanoes have? They can change Earth's surface by: Volcanoes Exploring There are 3 different types of volcanoes. Can anyone tell me what they are? Composite Volcanoes These volcanoes are made of layers of lava, rock, and ash. They have steep peaks and have explosive eruptions. Can anyone tell me the name of this famous composite volcano? What causes volcanoes to form? The vent is an opening that allows lava to escape. The magma chamber is an underground space where magma gathers before ascending to Earth's surface. Lava is the molten rock expelled from the volcano. To figure this out, we are going to look at what's going on beneath Earth's surface. Is the Earth made of one big slab of rock or is it made of layers? Can anyone name these layers in order from outer Earth to inner Earth? Earth's crust and upper mantle are broken into large slabs of rock called plates. The plates move on a layer of the mantle that can flow. Let's take a look at how these plates move. Some plates move towards one another. When two plates meet, the edges crush and fold as one is pushed under the other. This is how mountain chains are formed. Where a land plate and an ocean plate or two ocean plates meet, islands made of volcanic mountains can form. Some plates travel away from one another causing large cracks to appear. Magma oozes up through these cracks and hardens forming new crust. Plates can also slide past one another. Where this happens huge cracks appear. Shield Volcanoes These huge volcanoes erupt slowly, and lava flows steadily down their gently sloping sides. Hawaii has numerous shield volcanoes. This volcano, Mauna Loa, can be found there. Cinder Cone Volcanoes These volcanoes are small and have steep sides. They shoot chunks of rock into the air and down their slopes. They emit large amounts of ash and gases into the air. Kilauea Volcano, Hawaii Cinder Cone Volcano, California Causing destruction Forming new land Providing nutrients to the soil Can you help me classify these volcanoes? By Sarah Mangus
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