Fold Mountains

Fold Mountains are usually formed from sedimentary rocks when two tectonic plates move together on a convergent boundary. The Himalayas and the Alps are two examples of fold mountains. Here is the Bitesize revision section on fold mountains, but also check out the excellent S-Cool revision site too. Have a look at the videos below too. I especially liked the song version done by a group of pupils to the tune of Bryan Adams' "Heaven".

Earthquakes

Earthquakes are a sudden release of energy from movement within the earth's crust. They are most common at plate boundaries. There are thousands of earthquakes across the globe every day but most are too small to be detected without special equipment, although big ones can cause massive destruction. Have a look at the resources mentioned here to help you understand the causes and effects of this natural disaster.
A good place to start is the BBC website which has a great selection of resources on earthquakes. Still with the BBC, Bitesize has a good revision section on earthquakes, as does S-Cool and Cool Geography. If you want to find out more about measuring earthquakes then have a look at the Geography Site.
Have a look at this video too to help you understand the phenomena.