| A | B |
|---|
| fossil fuels | fuels formed by decay of plants and animals millions of years ago |
| bituminous coal | intermediate stage of coal formation |
| coal | principle fuel for our modern age |
| radioactive decay (radioactivity) | source of heat for geothermal wells |
| sun | constant source of Earth's energy |
| fusion | nuclear reaction that occurs on sun & other stars |
| Uranium-235 | used in fission process at nuclear plants |
| fusion reactors | least common type of nuclear reactors |
| biomass fuels | fuels made from organic materials; example: wood |
| reservoir | traps oil & gas |
| gasification | process of treating powdered coal with steam |
| magma | original source of all Earth's minerals |
| natural gas | better fuel because it pollutes less |
| plutonium | breeder reactors |
| backfilling | used to prevent a mine from collapsing |
| metallic & nonmetallic ores | two largest groups of nonrenewable resources |
| first step of reclaiming land | setting aside topsoil when mining begins |
| steel | alloy that is stronger than iron |
| acrid | bitter |
| pyrite | contaminates soil during mining |
| gangue | waste rock removed by crushing |
| maintaining safety | pressing mine problem |
| environment | sum of all external conditions that act upon an organism |
| valuable nonmetals | limestone, clay, sulfur, potash |
| Amazon River forest | major producer of oxygen |
| carbon monoxide | odorless, colorless, deadly by-product of incomplete combustion |
| bacteria | reduces sulfur content of coal |
| glaciers | 98% of Earth's fresh water trapped here |
| desalination | process of removing salt from ocean water |
| hard water | high in carbonates & sulfates |
| nuclei for raindrops | dust particles |
| sulfuric acid | sulfur dioxide combines with moisture |
| family | columns on periodic table |
| dot diagram | symbol for element surrounded by # of electrons in outer energy level |
| D Mendeleev | found meaningful way to arrange elements in periodic table (1869) |
| transition elements | electrons that combine with other elements present in multiple levels |
| quartz, coal, natural gas, diamonds | examples of nonrenewable resources |
| carbon | graphite and diamonds |
