Mountain: A landform that rises at least 2,165 feet about the surrounding land. This is site will explain what a mountain is, what they look like, where they are found and how they are formed. Also, you can learn about mountain ranges and mountain systems. You can also find pictures of mountains on this site. Did you know that one tenth of the world's people live on mountains?
Valley: a landform that is situated between two hills or mountains and is longer than it is wide. Valleys caused by erosion, most often by rivers. This site will give you facts and information about various types of valleys. Valleys can be caused by glaciers, the splitting of Earth's crust or rivers. It takes millions of years for a valley to form. Did you know that narrow valleys with high side walls are called gorges?
Volcano: An opening in the surface of the Earth from which gas, magma and ash escape. This site will give you 17 different facts about volcanoes. It also includes a video that explains volcanic eruptions in more detail. There is a lot of interesting information on this page! You can find out the types of volcanoes, where magma comes from, how volcanoes are formed and even facts about different volcanic eruptions! Did you know that there are over 1,900 different ACTIVE volcanoes on Earth's surface?
This is a video to help you understand more about mountains, valleys and volcanoes!