UT Arlington GEOL 1425 - rocks and the rock cycle (2 pages)

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rocks and the rock cycle

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rocks and the rock cycle


overview of rocks and their formation

Lecture number:
Lecture Note
University of Texas at Arlington
Geol 1425 - Earth Systems

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GEOL 1425 1st Edition Lecture 5 Outline of Last Lecture I Plate Tectonics II Atomic particles III minerals Outline of Current Lecture I Different types of rocks II Rock cycle III Metals and ores Current Lecture Definition of a rock natural aggregate of minerals and or other particles that are held together to form a solid material Sand and soil may make up rocks but are classified as sediments Magma is liquid rock Melted by extreme heat in mantle There are 3 rock families They are based on the origins of the rocks Igneous crystalized from melt magma Intrusive are hardened inside of the earth while extrusive are formed on the earth s surface Sedimentary rocks formed by sediments that are naturally cemented together from compression usually form layers Also could be minerals precipitated from fluids like salt Metamorphic sedimentary or igneous rock that has changed due to extreme pressure Lithification process by which sedimentary rocks are cemented Rocks are identified by texture size shape arrangement of particles and the minerals found in the rock Sedimentary rocks generally have loose material of sand and quartz grains Grains are cemented together and do not interlock Intrusive igneous rocks tend to have large uniform mineral grains and shape These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Extrusive igneous rocks tend to have small grains and large crystals b c they cool rapidly so no time for minerals to enlarge Metamorphic rocks tend to have a flat and elongated mineral grain Rock cycle ocean spreading causes new rocks to be formed while subduction zones pull under old rock to be formed again Near the sides of ocean erosion causes sediment build up and eventual sedimentary rocks Volcanoes produce rocks Ore deposits associated with intrusive igneous rocks like gold veins At Bingham canyon copper is diffused within the rocks so people mine the area This is one

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