Match the following 1. compressor

a valve that controls the flow of fluid from a high pressure area to a low pressure area

2. expansion valve

a layer of ozone (O 3) in the stratosphere that absorbs much of the incoming ultraviolet radiation from the Sun and prevents it from reaching the surface of Earth

3. ozone layer

a sequence of thermodynamic processes whereby the use of a refrigerant accomplishes the transfer of heat energy so that cooling results

4. refrigerant

a pump that increases the pressure of a gas

5. refrigeration cycle

a substance used to transfer heat energy while vaporizing and condensing

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

My answer is opptionc, just check with anyone else