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  2. Rock cycle - Wikipedia

    en.wikipedia.org/wiki/Rock_cycle

    The rock cycle is a basic concept in geology that describes transitions through geologic time among the three main rock types: sedimentary, metamorphic, and igneous. Each rock type is altered when it is forced out of its equilibrium conditions.

  3. The Joy of Science - Wikipedia

    en.wikipedia.org/wiki/The_Joy_of_Science

    The Joy of Science is a popular video and audio course series, consisting of 60 lectures, each 30 minutes long, ... The Rock Cycle 03 The Ordered Universe 23

  4. Original - The rock cycle is a fundamental concept in geology that describes the dynamic transitions through geologic time among the three main rock types: sedimentary, metamorphic, and igneous. Due to the driving forces of the rock cycle, plate tectonics and the water cycle , rocks do not remain in equilibrium and are forced to change as they ...

  5. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    In science, most common topics include the rock cycle, fossils, erosion, electricity, forces and motion, light, and heat. Other topics may be taught depending on the school districts or state's curriculum. In English, kids learn skills about reading, writing, and vocabulary.

  6. Formation of rocks - Wikipedia

    en.wikipedia.org/wiki/Formation_of_rocks

    This article discusses how rocks are formed. There are also articles on physical rock formations, rock layerings , and the formal naming of geologic formations. Terrestrial rocks are formed by three main mechanisms: Sedimentary rocks are formed through the gradual accumulation of sediments: for example, sand on a beach or mud on a river bed. As ...

  7. Cyclic sediments - Wikipedia

    en.wikipedia.org/wiki/Cyclic_sediments

    Rhythmic cycles of deposition in sedimentary rock in Becquerel Crater, captured by the High Resolution Imaging Science Experiment camera on the Mars Reconnaissance Orbiter Cyclic sediments (also called rhythmic sediments [ 1 ] ) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types ( strata ...

  8. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. List of rock formations - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_formations

    A rock formation is an isolated, scenic, or spectacular surface rock outcrop. Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term rock formation can also refer to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies.