Volcanoes. Do Now 11/12/13 1.What is magma? 2.At which type of plate boundary are volcanoes most...
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Transcript of Volcanoes. Do Now 11/12/13 1.What is magma? 2.At which type of plate boundary are volcanoes most...
![Page 1: Volcanoes. Do Now 11/12/13 1.What is magma? 2.At which type of plate boundary are volcanoes most common? 3.Which mineral is the hardest? The softest?](https://reader030.fdocuments.net/reader030/viewer/2022032606/56649e9d5503460f94b9dd91/html5/thumbnails/1.jpg)
Volcanoes
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Do Now 11/12/13
1. What is magma?
2. At which type of plate boundary are volcanoes most common?
3. Which mineral is the hardest? The softest?
4. What is the difference between a clastic sedimentary rock and an organic?
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Do Now 11/13/13
1. What is density?
2. How does density affect plate movement?
3. How does density affect the layers of the Earth?
4. How does density affect the formation of volcanoes?
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Do Now 11/12/131. When plates move together they form a
________________ boundary.
2. When plates move apart they form a ___________________ boundary.
3. When plates slide past each other they form a ____________ boundary.
4. The theory that plates were once joined in a supercontinent is called _______________.
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Do Now 12/3/121. Human Activity: The natural movement of
sediment from one place to another is called _______.
2. Pollution: Water pollution is caused by __________.
3. Natural Resources: A natural resource that cannot be reused or replaced quickly.
4. Waves: The distance between the crest and trough of a wave is called the _________.
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1) What is a volcano?• A mountain that forms when molten rock
(magma) is forced to the Earth’s surface.
Mt. Saint Helens, WashingtonLast Eruption 2008
Pavlof Volcano, AlaskaLast Eruption 2007
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2) What are the parts of a volcano?
• Magma Chamber –large underground pool of molten rock.
• Main Vent – where hot magma has reached the surface.
• Crater – a funnel shaped pit at the top of the volcano.
• Ash Cloud – gas and small pieces of pulverized rock.
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2) What are the parts of a volcano?
• Lava – Molten rock above the Earth’s surface.
• Pyroclastic Material – rock fragments, ash, gas released during eruption.
• Side Vent – secondary place where lava escapes the volcano.
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3) What are the three types of volcanoes?
Shield Composite
Cinder Cone
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Shield Volcanoes• Formed from runny lava and basalt• Non explosive eruptions• Gentle sloping sides• Wide base• Forms underwater
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Examples of Shield Volcanoes
• Hawaiian Islands
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Cinder Cone Volcanoes
• Made of pyroclastic material
• Explosive eruptions
• Steep sides
• Narrow base
• Found in clusters
• Erode quickly because there is no lava to cement rocks together
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Examples of Cinder Cone Volcanoes
• Paricutin - Mexico
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Composite Volcanoes
• Made from alternating layers of lava and pyroclastic material
• Non explosive and explosive eruptions
• Steep sides
• Wide base
• Also called Stratovolcano
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Example of Composite Volcano
• Mount Hood, Oregon
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4) What is a non explosive volcano?
• A volcano that produces lava flows.
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5) What is an explosive volcano?
• Volcanoes that blast out gas, rock, ashes/dust, and superheated steam.
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6) What determines if a volcano is explosive or non explosive?
• The composition of the magma determines what type of eruption.
- Explosive volcanoes have more water and silica.
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7) What is a caldera?
• A circular depression that forms when a magma chamber empties and causes the ground above it to sink.