Some rocks start as magma. Magma soon cools and becomes Igneous rock. Igneous rock has no layers and are highly durable. Igneous rock is found in the Earth's crust where volcanoes are and also where cooled magma is. Igneous rocks are used for walls, bridges and buildings.
Weathering & Erosion
Rocks go through lots of changes. One of them is weathering and erosion. Weathering is when it breaks rocks down. Weathering can be physical (wind & rain), chemical (acid rain & dust) and biological weathering (plants & animals). Physical \weathering uses wind and rain to break the rock down by hitting the rock, making it less durable and more likely to break. Chemical weathering uses acid rain and dust to break rocks down. Acid rain is basically normal rain that has chemicals in it to make rocks disintegrate but the rain doesn't harm us. rust makes the rock rot away until it is no more. Biological weathering is when plants and animals break rocks down. Plants break down rocks by growing their roots near rocks and dripping plant acids on the rock to make it dissolve.
sediment, compacting and cementing
Sediment is in walls made of rock in the wild. There are three types of sediment. There is biogenous (sediment from broken down organisms), hydrogenous (sediment from chemical reactions in seawater) and cosmogenous (sediment from space).
Magma is inside volcanoes. When volcanoes erupt, magma (which becomes lava when it comes out of a volcano), flies out and lands on the ground. After a while, Magma will cool and become Igneous rock.
Sedimentary rock, heat and pressure
Sedimentary rocks are formed by years and years of sediment compacting together and becoming hard. Sedimentary rocks are distinctively layered and are easy to crumble and fall into a large amount of tiny pieces. A stream will carry lots of small pieces of rocks and minerals to a larger body of water. These pieces will settle at the bottom for a very long time, they will form into solid rock. Sedimentary rocks are used for energy, construction and building stone.
Erosion is what carries away what Weathering has done with the rock/s (breaking the rock/s down) , using gravity, wind and ice. Gravity helps the rock come off the ground, wind pushes the rock, and ice can move the rock.
Metamorphic rock and melting
Metamorphic rocks are formed by great heat and pressure. Metamorphic rocks may or my not have layers, they are relatively hard. Metamorphic rocks are found inside the Earth's crust where there is enough heat and pressure to form the rocks. Metamorphic rocks are used for kids to play with.
This part of the rock cycle is called compaction and cementation. Compaction is when At the same time the particles of sediment begin to stick to each other. Cementation is when they are cemented together by clay, or by minerals like silica or calcite. After compaction and cementation, the sediment has been changed into a sedimentary rock.
Heat, pressure and chemical fluids are the three factors that contribute to metamorphism. Heat can come from the compressive force of gravity, friction between tectonic plates or radioactivity. Pressure builds as rock is buried, and more rock piles on top of it.
At the end of the rock cycle, metamorphic rocks melt and become magma like our rocky friend who has been helping us along the way. After being melted, rocks will wait until a volcano erupts and will cool and the rock cycle will start all over again.
NOOOOOOOOOO!!!!!!!I want to stay as a rock!!!!!!!!!!!!!!!!!!!