GLG 112 1st Edition Lecture 9Outline of Last Lecture I. Hot SpotsA. Examples a. Hawaii (oceanic plate)b. Yellowstone (continental)c. Iceland (hot spot on a plate boundary)Outline of Current LectureThe Rock CycleII. Rocks and mineralsA. Definitions1. Rock2. MineralB. Types of Rocks1. Igneous Rocksa. Intrusiveb. Extrusive2. Sedimentary Rocksc. Detritald. Chemical 3. Metamorphic RocksThese 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.e. Foliatedf. Non-foliatedCurrent LectureA rock is an aggregate of minerals. EXAMPLE: graniteA mineral is a naturally occurring, inorganic solid with a specific chemistry and structure. EXAMPLE: halite (salt)Three types of rocks: 1. Igneous rocks form from crystallized lava/magma. a. Intrusive igneous rocks form underground. They are slow cooling and have large crystals that you can see easily with the naked eye. EXAMPLE: graniteb. Extrusive igneous rocks form at the earth’s surface. They are fast cooling and have small crystals that you cannot see with the naked eye. EXAMPLE: basalt2. Sedimentary rocks are formed from sediment. Sediment is pieces of rock that are not connected to the earth. a. Detrital sedimentary rocks are made of sediment you can see. EXAMPLE: sandstoneb. Chemical sedimentary rocks EXAMPLE: limestone3. Metamorphic rocks form under intense heat and pressure.a. Foliated means the minerals are all going in one direction. This means it will only cut in one direction. It is almost as if they were pushed together by a convergent plate boundary. The location of these rocks can tell where a convergent plate boundary is or used to be. EXAMPLE: slateb. Non-foliated means the minerals are going every which way. This makes it easier to cut in many angles. EXAMPLE:
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