Civilization {Ans: A complex society that possesses a degree of historical and cultural unity.}Nebula {Ans: An interstellar cloud of dust and gas.}Productivity {Ans: A measure of the efficiency of a person, machine, factory, system, etc., in converting inputs into useful outputs.}due process {Ans: fair treatment through the normal judicial system, especially as a citizen's entitlement.}Kinetic Energy {Ans: found in movement. Can be motion, thermal, electric, sound.}Atmosphere {Ans: The Earth's atmosphere is primarily nitrogen and oxygen. - atmosphere extends to the surface of about 10km. - stratosphere extends from 10km to 50km - mesosphere extends from 50km to 80km - thermosphere extends beyond 80km}