| A | B |
|---|
| aqueducts | artificial channel for water |
| chemical energy | energy stored in the bonds between atoms in molecules |
| cisterns | artificial reservoir or tank for storing water usually underground |
| coal | solid form of fossilized plants |
| conservation | controlled use or systematic protection of natural resources |
| electrical energy | the energy of moving electrons |
| energy | useable power that has the capacity for doing work |
| energy transformation | the change from light and heat to mechanical, chemical, and electrical energy |
| fossil fuels | formed from ancient plants and animals, coal, oil, natural gas |
| generate | to bring into existence |
| geothermal | energy obtained from hot magma beneath the Earth' surface |
| hydro | pertaining to water |
| hydroelectric | production of electricity by waterpower |
| kinetic energy | moving energy |
| mechanical energy | erergy involved in the motion of machines |
| motion | a change of position |
| natural gas | a mxture of hydrocarbon gases tht occurs with petroleium deposits used a a fuel and in manufacturing organic compounds |
| nonrenewable energy sources | a resource such as oil, coal, or natural gas, that can be used up faster than it can be replenished |
| nuclear power | energy found in the nucleus of an atom |
| potential energy | stored energy |
| renewable resources | a resource that is in great abundance and is continually produced, such as wind, sunlight, or lumber that can be replaced naturally if used wisely |
| solar energy | electromagnetic radiation from the sun |
| thermal energy | the energy of moving particles and arrangements of molecules in a substance |
| force | push or pull one body exerts on another |
| hydrosphere | all the water of the Earth |
| absorb | to take in or suck or swallow up |
| adhesive | to stick by or as if by gluing, suction, grasping or meltin |
| Celsius | scale for measuring temperature |
| cohesive | action or state of sticking together |
| contamination | to make impure or unfit for use by adding something harmful or unpleasant |
| density | mass of a substance per unit of volume |
| dissolve | to mix or cause to mix with a liquid so that the result is a liquid that is the same throughout |
| gas | matter with no definite shape or volume |
| gravity | the force of attraction between any two bodies that have mass |
| liquid | matter with a volum but no definite shape |
| molecule | smallest particle of a substance having all the characteristics of a compound |
| solid | matter with definite shape and volume |
| surface tension | the attractive force felt by surface molecules of a liquit |
| heat energy | how active the atoms and molecules are |
| humidity | the amount of moisture in the air |
