Temperature inversions occurselect one: a. when surface temperatures are higher than overlying layers of air. b. when there is good air drainage and ventilation of the surface air. c. when surface temperatures are lower than warmer overlying air. d. during episodes of reduced air pollution.

Asappp which of the following is not a requirement for an adult to become a u. s. citizen? have been born on u. s. soil pass a u. s. history and government test be a legal, permanent u. s. resident swear loyalty to the united states

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.

An externality can be created by a. people working at a production job and enjoying their work b. a production activity but not a consumption activity c. a consumption activity but not a production activity d. a production activity or a consumption activity externalities a. are always positive, and an example is flu vaccinations b. are always negative, and an example is the pollution created by trucks c. can be negative or positive. logging has a negative externality, and education has a positive externality d. can be negative or positive. a negative externality is having to go to school when you would rather go to the beach, and a positive externality is spending time with your friends