If gold gets hot enough, it will melt. what type of change is this?
a)physical
b)chemical
c)both

yep c, she is right because its melting and your can see it actually happening, and chemical because it is also happening internally (by that i mean internally in the ice.) :)

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

uranium fissions/breaks up giving out energy and neutrons