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3 Types of Rocks – PowerPoint Igneous Rocks are formed by: They form as a result of: Where are they commonly found? 4 Different texture classifications What does crystal size tell us? Glassy – Aphantic – Phaneritic – Poryphyritic – Dark igneous rocks form from _________________ or ____________ _____________. Mafic refers to: How hot is the magma? Texture when hot? Light colored igneous rocks are formed form ______________ or ________________ magmas. How hot is this magma? Texture when hot? Igneous rock formations include: Igneous rock examples: Sedimentary rocks are formed: What traits do the areas have? Likely to form in these areas: 2 Groups: Clastic are made of ____________ of other ______________ that have been ______________________ or ___________________. How are they grouped? Mudrock has Sandstone has Conglomerates have Biochemical rocks form from Chemical precipitates form in What conditions show sedimentary rock formation? Sedimentary rocks examples: Metamorphic rocks are formed by _________ and __________________. Where do they form? Contact metamorphism is the process where Regional metamorphism occurs at plate subduction zones and in deep mountain roots as pressure ________________ and heat ________________. 2 major groups: Foliated rocks form when: They have ______________ or ______________ where they can easily break. Nonfoliated rocks formed when: Structures commonly found in metamorphic formations: Metamorphic rock examples: