If a substance forms crystals when it solidifies, its points are the same.
a. melting and freezing
b. melting and condensation
c. evaporation and freezing
d. evaporation and condensation

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?