Earth and rocks

• earths structure


  sphere with a layered structure. Crust - the thinest outer layer of solid rock, mantle- mostly solid but deep down can flow very slow like liquid. inner and outer core - made of iron and nickel.
• earths structure 2


  The earths structure is made up or tectonic plates. Like big rafts that float on the mantle. they move very slowly like a cm a year, sometimes suddenly causing an earthquake, happeneing when tectonic plates meet
• igneous rocks


  formed from magma pushed up to the surface of the crust. They contain various minerals in randomly arranged interlocking crystals. The size depends on the speed of the cooling. Type types of igneous, extrusive and intrusive. Example- basalt is extrusive and granite is intrusive.
• sedimentary rocks


  formed from layers of sediment laid down in lakes or seas over millions of years. the layers are cemented together by other minerals. fossils can form in these sediments.
• fossil


  These are long dead remains of plants and animals
• Metamorphic rocks


  These are the result of heat and increased pressure acting on existing rocks over long periods or time. They may have really tiny crystals and some layers
• weathering


  breaking down rocks into smaller bits. there are a few different ways this can happen. chemical, biological and physical weathering
• erosion


  wearing down rocks
• transportation


  moving the eroded bits of rock round the world by wind and water
• deposition


  laying down of water
• cementation


  squeezing and compressing the layers , eventually forming into sedimentary rocks
• the carbon cycle


  photosynthesis removes carbon dioxide from the air. carbon is passed along the food chain when animals feed. respiration and combustion return carbon dioxide to the air.
• Rock cycle diagram 


  Diagram

  
• Carbon Cycle
• Food Chain