Volcano

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Volcano

Learning Objectives

At the end of the lesson you will understand the formation and types of volcanoes. At the end of the lesson you will be able to explain the relationship between tectonic plate movements and volcanic activity. At the end of the lesson you will identify the effects of volcanic eruptions on the environment and climate. At the end of the lesson you will recognise the different types of volcanic landforms and features.

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What do you already know about volcanoes?

Formation and Causes of Volcanoes

Volcanoes are ruptures in the crust. Magma, ash, and gases escape. Commonly found at tectonic plate boundaries.

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Tectonic Plate Boundaries

Divergent boundaries create new crust. Convergent boundaries lead to subduction. Hotspot volcanism occurs due to mantle plumes.

Types of Volcanoes

Shield volcanoes: broad and gently sloping. Cinder cones: steep and formed from tephra. Stratovolcanoes: layered lava flows. Supervolcanoes: massive eruptions with vast deposits.

Effects of Volcanic Eruptions

Can impact climate by cooling the Earth. Historical examples include volcanic winters. Effects on agriculture and food supply.

Volcanism on Other Planets

Volcanic activity observed on Mercury. Understanding volcanism helps us learn about other celestial bodies.

Definition List

Volcano: A rupture in the crust allowing magma, ash, and gases to escape. Divergent Plate Boundaries: Regions where tectonic plates move apart, creating new crust. Convergent Plate Boundaries: Areas where plates collide, often forming volcanoes through subduction. Hotspot Volcanism: Volcanic activity resulting from mantle plumes rising from deep within the Earth. Shield Volcano: Broad, gently sloping volcano formed by low-viscosity lava flows. Stratovolcano: Tall, conical volcano with layered lava flows and tephra. Supervolcano: A volcano capable of producing an eruption with vast volumes of volcanic deposits. Submarine Volcano: Underwater volcanoes, often forming new islands. Subglacial Volcano: Volcanoes formed under ice caps, creating unique landforms. Mud Volcano: Formations created by the eruption of mud and gases.

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