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How are Rocks formed
What are rocks made ofIgneous rocks formationFormation of sedimentary rocksFormation of metamorphic rocksphysical weathering of rocksChemical weathering of rocksBiological weathering of rocksRock erosion and transportExplain the rock cycle



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The rock cycle for kids



The Rock Cycle

When rocks form, they do not stay the same forever. They also do not stay at one place forever. They move about. The rock cycle is the entire journey rocks make as they change. These take millions of years.

Let us start the cycle with molten magma in the earth core.

diagram of the rock cycle


rock cycleMolten magma may cool off and crystalize beneath the earth’s crust, forming intrusive igneous rocks. With time, pressure may cause uplift and rocks end up on the surface.

rock cycleMolten magma may also flow to the surface by volcanic action, causing extrusive igneous rocks as they harden and crystalize.

rock cycleOn the surface, they undergo weathering, erosion and transport. Sediments are therefore carried to low lying places and into rivers and water bodies. The pilling up of sediments cause compaction and cementation. Sedimentary rocks form.

rock cycleAfter a long period of pressure and heat from the overlying weight, the igneous and sedimentary rocks buried deep inside the crust change to metamorphic rocks, deep under the earth’s crust.

rock cycleSome of the metamorphic rocks begin to melt as they get closer to the molten magma region. Some will also undergo uplift to the surface again, in places where volcanic activity is not common. If they melt, they get released back to the surface through volcanic activity, especially in places with high tectonic activity.   

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Our reading on this lesson included the following sources:

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Types of rocks for kids



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