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Volcanoes: Demolition and Reconstuction
Transcript of Volcanoes: Demolition and Reconstuction
Why? Here is something small... Here is some context. Provide some common ground.
Or something from the present, that we should look beyond. Volcanoes An Example: 30 Photo credits: 'horizon' by pierreyves @ flickr So... Volcanoes can be found in areas such as the Hawaiian islands, Iceland, and the Mid-Atlantic Ridge. Many volcanoes are found in the Pacific Ring of Fire, which is a round formation of volcanoes circling around the Pacific Ocean. Volcanoes are formed from at least three different causes. Volcanoes can be found in areas where tectonic plates are moving away from or towards each other. These are called divergent boundaries. When the plates move, lava flows up and cools, building a foundation. After many years, a volcano is formed. The Mid-Atlantic Ridge was formed at divergent boundaries.
When an oceanic plate slides underneath a continental plate, it forces up magma, which also creates volcanoes. These are called convergent boundaries. The Soufriére Hills volcanoes were formed at convergent boundaries.
Hot Spots are boundaries of Earth’s mantle and core. At these areas, hot rock is partially melted, and is forced to the crust, where it cools. Here, volcanoes and bodies of land can be formed. The Hawaiian islands were formed by the same Hot Spot, many years ago. There are four types of igneous rock. One of them is called a batholith. A batholith is formed when magma inside a volcano cools and solidifies before reaching the surface. A sill is formed when magma is forced into a crack that is parallel to rock layers and hardens. Dikes are formed when magma is forced into cracks that cut across rock layers and hardens. When a volcano stops erupting, the magma hardens inside what is known as the vent. Over a long period of time, erosion wears away at the outside of the volcano, eventually leaving behind just the core, called a volcanic neck. Volcanoes play a big role in the rock cycle. Almost every day, new igneous rock is formed by volcanoes. Magma hardens, and creates new rock, which is also broken down by erosion. Volcanoes create rocks and land, erosion takes it down. It’s a continuous cycle that keeps the Earth relatively the same size and shape. When a volcano erupts, lava can harden to create new land. Volcanoes can also take away land, when subduction occurs to create a new volcano. When volcanoes erupt, the lava and pyroclastic flows destroy and burn everything in their path, whether it’s vegetation or civilizations. Because of volcanoes and other processes, no two days on Earth look the same. Magma Pyroclastic Flow Erupting Volcano