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The Rock Cycle

Rock Cycle
by

Kevin Borling

on 23 October 2012

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Transcript of The Rock Cycle

Magma When lava cools and solidifies (Crystallization), Extrusive Igneous Rock forms. Crystallization When sedimentary rock is buried deep in the crust, heat and pressure (Metamorphism), cause it to become Metamorphic Rock. THE ROCK CYCLE By: Kevin Borling What is a Rock Cycle? A Rock Cycle is the process by which rocks are formed, altered, destroyed, and reformed by geological processes and which is recurrent, returning to a starting point. But where does the rock cycle start?? The rock cycle has no beginning or end. However, for the sake of convenience and clarity, and because every rock on Earth can be traced back to a molten state, the cycle is often said to begin with magma, or molten rock beneath the Earth's surface. Magma refers to molten rock deep within Earth that consists of liquids, gases, and particles of rocks and crystals.
Temperatures of most magmas are in the range 700 °C to 1300 °C 3 basic types of magma: Basaltic (the most common, originating in the lower crust/upper mantle).
Rhyolitic (originates in the oceanic crust).
Andesitic (most originate in the continental crust). Magma is the source of igneous rocks.
It can intrude or force itself into surrounding rock where it cools and eventually hardens.
These rocks are called Intrusive Igneous Rocks. When magma makes its way to Earth's surface, the molten rock erupts or flows above the surface as lava! Quick Facts about Basalt! Basalt is the most common rock in the Earth's crust.
Almost all oceanic crust is made of basalt.
Basalt is also found throughout most of Washington State! Weathering breaks down rock that is transported and deposited as Sediment. Sediment is compacted and cemented (Lithification), to form Sedimentary Rock. It takes temperatures between 600 and 1,300 degrees Celsius (1,100 and 2,400 degrees Fahrenheit) to melt a rock, turning it into a substance called Magma (molten rock).
The End? NO! The Rock Cycle is a natural process that is always continued! Metamorphic Rock and Sedimentary Rock can also become Sediment through uplift, weathering, transportation, and deposition. Igneous Rocks can also form into Metamorphic Rock through heat and pressure. Here's a map of the United States containing the Three Rock Forms! But That's Not All!
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