The Big Bang is difficult to envisage and some of the web sites about it are difficult to understand. Sometimes when things sink it can be disastrous. Here are some sinking links. If your computer is fast enough take a virtual tour of some of the galleries. Applying the Heat Asbestos is heat resistant and hazardous.
Milk is a mixture.
Find out how salt is removed from water. See how impurities affect melting points and find out how melting points can be used to identify substances using a melting point apparatus.