... mountains, and yesterday we went to old Inca city of Machu Picchu and …(34)… some sightseeing. It was …(35)…! We didn’t have a lot of time there, but we saw everything and I …(36)… many photos.Hope ... The three most important fossil fuels are coal, petroleum, and natural gas. They contain hydrocarbons, or things that have only hydrogen and carbon in them. Fossil fuels can be used to make electricity ... make electricity in a power plant. They are burned to heat water in to steam, which can push a fan-like object called a turbine. When the turbine spins around, magnets in it make electricity....