Rock Cycle - FRANKLIN ACADEMY YEAR 1 · Rock Cycle Earth’s rocks change from one type into...
Transcript of Rock Cycle - FRANKLIN ACADEMY YEAR 1 · Rock Cycle Earth’s rocks change from one type into...
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Rock Cycle Picture Vocabulary
7.E 6.2 Rock Cycle
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Earth’s Evolution
Originally, Earth was partly molten, allowing dense metals to sink to its core and less dense material to
separate into layers around the core. Over time, many changes have built up and worn down features on
Earth’s surface.
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Mineral Composition
The unique combination of solid elements and compounds that make up a mineral
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Rock Cycle
Earth’s rocks change from one type into another over time due to various Earth processes.
Changes occur in mineral compositions and physical structures.
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Igneous Rock
Igneous rock is formed when lava or magma cools and solidifies. Lava cools quickly and forms rocks with small
crystals, while magma cools more slowly and forms rocks with larger crystals.
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Lava
Molten rock or magma that has reached Earth’s surface by volcanic action; characterized by small crystals due
to rapid cooling on Earth’s surface
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Magma
Melted or molten rock material beneath Earth’s surface; cools slowly to form rocks with larger
crystals
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Metamorphic Rock
Metamorphic rock is formed deep underground where heat and pressure cause existing rocks to be changed in both mineral composition and structural characteristics.
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Heat and Pressure
Changing variables due to the weight of overlying rocks, causing changes to rock characteristics and mineral
composition, thus forming metamorphic rocks
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Sedimentary Rock
Sedimentary rock forms when particles of other rocks are deposited in layers and are compacted (crushed together) and cemented (binding of the sediments).
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Compaction
Occurs when rock particles or sediments are pressed together or packed down by gravity
and the pressure of overlying rock layers
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Cementation
Occurs when compacted sediments stick together and turn into rock
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Plate Tectonic Theory
Theory that the lithosphere is divided into tectonic plates that slowly move on top of the asthenosphere
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Weathering
The mechanical or chemical processes that break rocks into smaller pieces and sometimes change
the chemical composition
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Erosion
The process by which water, ice, wind, and gravity remove and transport sediment from one
place to another
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Deposition
The process by which gravity, water, wind, and ice deposit weathered and relocated sediment
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Ocean Trench
Deep and narrow depressions in the seafloor where the subducted plate moves into the
asthenosphere
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Mountain
A large landform that is formed by volcanos or the movement of the tectonic plates
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Volcanic Eruption
Event in which molten rock spews out from the mantel to the surface of Earth as ash, lava, and gases; major geological event that occurs when a dense plate subducts below a less dense plate