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Volcanoes Formation

Volcanoes Formation. An opening in the Earth’s surface through which magma rises Most observed volcanoes occur at colliding boundaries. One lighter plate (oceanic plate) sinks below a heavier one (continental plate) Other volcanoes occur at spreading boundaries on the ocean floor

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Volcanoes Formation

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  1. Volcanoes Formation • An opening in the Earth’s surface through which magma rises • Most observed volcanoes occur at colliding boundaries. • One lighter plate (oceanic plate) sinks below a heavier one (continental plate) • Other volcanoes occur at spreading boundaries on the ocean floor • Gentler eruptions - lava quietly flows onto the surface of the plate • New ocean floor is created

  2. Types • Shield • formed from lava flows that harden • Cinder Cone • formed from explosive eruptions in which volcanic materials are thrown high in the air and pile up around the vent of the volcano. • Composite - formed from alternating explosions and lava flow

  3. Features • Crater • Deep sided depression at the top on the side of a volcano • Formed during an eruption • Magma • Molten rock inside the Earth • Lava • Molten rock which reaches the Earth’s surface • Caldera • Crater, at least 1.6 KM (.99 mile) wide • Crater Lake in Cascade Mountains • Geysers • Groundwater heated to its boiling point by trapped magma and erupts onto the surface • Old Faithful • Volcanic Ash • Tiny bits of rock thrown into the air during an eruption • Can form thick clouds of ash and cinders

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