The Rock Cycle
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The rock cycle describes the way that rock material cycles through Earth's crust. All
rocks start out as lava or magma that cools into igneous rock. An igneous rock must then
be weathered into sediments for the next stage of the cycle. Sediments are compressed
and cemented to become sedimentary rock. Metamorphic rock forms when rocks are
heated and squeezed deep in Earth's crust. New igneous rock forms when metamorphic
rock is heated so much that it melts into magma, which cools into igneous rock. All rocks
go through this cycle over and over again.
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A reaction in which energy is released to the surroundings is called an exothermic reaction. in this type of reaction the enthalpy, or stored chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water, energyis absorbed and the water cools.
If you see a sedimentary outcrop and red layers of sand are at the top of pale layers of rock, what does this tell you about the ages of the rock layers?