Tooth fillings are often made of gold or porcelain because those materials are not

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

If forces acting on an object are unbalanced. true or false

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.