Review Crossword

A chemical element or inorganic compound that exists as a solid with a regularly repeating internal structure.
A solid combination of one or more minerals found in Earth's crust,
The portion of a mineral resource that is economically and technically feasible for mining.
A type of rock that contains a large enough concentration of a mineral.
_______ time is the time it takes to use up a certain proportion of the reserves of a mineral at a given rate.
_____ energy is the amount of high-quality energy available from a given quantity of an energy resource minus the high-quality energy needed to make that energy resource available.
This is the world's most abundant fossil fuel.
______ gas contains a mixture of gases,of which 50-90% is methane.
Requires an enormous amount of energy and decreses oil's net energy.
Nuclear _______ occurs when a neutron is used to split a large nucleus into two or more smaller nuclei.
One way utility companies and industries can save energy is to use _________ to produce two useful forms of energy from the same fuel source.
The ______ fuel cell is another potential energy resource, which could be used to power eletric vehicles.
A building that has enough access to sunlight can get all or most of its heat through a ________ solar heating system.
An _______ solar heating system captures energy from the sun by pumping a heat-absorbing fluid such as water or an antifreeze solution through special collectors.
Solar energy can be converted directly into electrical energy using _________ cells.
______ waste is any unwanted or discarded material people produce that is not a liquid or a gas.
This type of solid waste is produced by mines, farms, and industries that supply people with goods and services.
This type of solid waste is often called garbage or trash and consists of the combined solid wastes produced by households and workplaces other than factories.
In a _____________________, solid waste is spread out in thin layers, compacted, and covered daily with a fresh layer of clay or plastic foam.
______ mimics nature by using bacteria to decompose yard trimmings, vegetable food scraps, and other biodegradable organic waste into humus.