Which of these best describes the concept of the rock cycle?
a) sedimentary rocks may be remelted several times
b) rocks move in circles on the earth as the earth rotates
c) rocks can be moved from place to place on the earth without changing
d) rocks are continually changing, and any type of rock may be
transformed into another type by appropriate processes

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.

Which of the following statement is false