earth science

• metallic minerals are called native elemets and exist as pure metal
• an ore is a natural materials whose concentration of a mineral is high enough to be mined
• mined by miners who work underground called subsurface mining
• when mineral deposits are located close to earth surface,they are mined by using surface mining methods
• minerals in placer deposits are mined by dredging or the removal of sedimentys abd debris from bodies of water
• deep sea mining requires miners to fine nodules which are lumps of minerals that contain iron
• nonrenewable resources are sources that form at rate that is much slower than the rateb they consumed
• fossil fuels are nonrenewable energy source formed from remains of plants and animals
• there are 4 major types of nonrenewable sources which is coal,petroleum,nuclear energy,and natural gases
• fossil fuels were formed within earth ,found underground
• fossil fuels are made of hydrocarbon
• coal,a type of rock most commonly burned fossil a reliable sources of enrgy
• petroleum is a liquid fossil fuel
• natural gas is the cleanest burning fossil fuel
• the sun provides us with light and warmth
• natural gases is type of fossil fuels that is generally used for cooking and heating homes
• the most common radioactive material know is urinum
• nuclear power plants use nuclear energy to generate electricity
• nonrenewable energy can also obtained or harnessed from radioactive elemts called nuclear energy
• nuclear energy harvest the powerful energy in the nucleus of atom in a process called nuclear fission
• fossils are remains of prehistoric animals, plants, and microorganisms preserved in rocks