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Volcanoes and volcanic Activity
Volcanic Activity - Volcanoes form when magma reaches the Earth's surface, causing eruptions of lava and ash. They occur at destructive and constructive plate boundaries. - The Mid Atlantic Ridge under the Atlantic Ocean was formed when plates separated and lava came to the surface, cooled and hardened. - Most earthquakes and volcanoes occur along the Pacific Ring of Fire.
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Volcanoes and volcanic Activity
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- 2. • Volcanoes formwhen magma reaches the Earth's surface, causing eruptions of lava and ash. They occur at destructive and constructive plate boundaries • Magma – Molten Rock Underground • Lava – molten rock on Land Volcanic Activity
- 3. The Mid AtlanticRidge Under the Atlantic Ocean lies a long, narrow chain of mountains called the Mid Atlantic Ridge.
- 4. Mid Atlantic Ridgewas formed when plates separated and lava came to the surface and cooled and hardened.
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- 6. Mid Atlantic RidgeIn Iceland
- 8. The Pacific Ringof Fire. Most earthquakes and volcanoes occur along this line.
- 10. Volcanoes – Goodand Bad Benefits Drawbacks
- 11. • A volcanois a cone-shaped mountain or hill, formed by eruptions of lava and ash. • When magma reaches the Earth's surface it is called lava. When the lava cools, it forms rock. • Volcanic eruptions can happen at destructive and constructive boundaries, but not at conservative boundaries. • Some volcanoes happen underwater, along the sea bed or ocean floor. Volcanic eruptions
- 12. • Magma risesthrough cracks or weaknesses in the Earth's crust. • Pressure builds up inside the Earth. • When this pressure is released, magma explodes to the surface causing a volcanic eruption. • The lava from the eruption cools to form new crust. • Over time, after several eruptions, the rock builds up and a volcano forms. • How volcanoes form
- 14. A volcano hasseveral important features: • The magma chamber is a collection of magma inside the Earth, below the volcano. • The main vent is the main outlet for the magma to escape. • Secondary vents are smaller outlets through which magma escapes. • The crater is created after an eruption blows the top off the volcano.
- 17. One way todescribe volcanoes is in terms of activity: • Some volcanoes are still active and erupt frequently (Etna and Vesuvius Italy) • Some volcanoes are dormant (sleeping). (Cotopaxi, Peru) • Some volcanoes are extinct (never likely to erupt again). (Slemish, Co.Antrim) Different types of Volcanoes.
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