Volcanic Mountains.
Volcanoes form at hot spots in the Earth's crust, at convergent plate boundaries where subduction of oceanic crust is occurring, and at divergent plate boundaries where gaps i … n the crust are being infilled with rising magma. at fault lines, or places of crustal activity :) Volcanoes usually form near plate boundaries where subduction is occurring. This causes magma from the mantle to rise up ont … o Earth's surface and form volcanoes. Most volcanoes are formed in this way. Volcanoes usually form near plate boundaries where subduction is occurring. This causes magma from the mantle to rise up onto Earth's surface and form volcanoes. Most volcanoes are formed in this way. Volcanoes can also be formed by hotspots. Volcanic mountains form when molten rock from deep inside the Earth erupts through the crust and piles up on itself. The island chain of Hawaii is actually the tops of volcanoes. Well-known volcanoes on land include Mount St. Helens in Washington State and Mount Fuji in Japan. Other types of mountains form when stresses within and between the tectonic plates lead to cracking and faulting of the Earth's surface, which forces blocks of rock up and down. Examples of fault-block mountains include the Sierra Nevada in California and Nevada, the Tetons in Wyoming, and the Harz Mountains in Germany. Volcanic Mountains. As the name suggests, volcanic mountains are formed by volcanoes. Volcanic Mountains are formed when molten rock (magma) deep within the earth, erupts, and piles upon the surface. Magna is called lava when it breaks through the earth's crust. When the ash and lava cools, it builds a cone of rock. Streams usually form rivers in the higher elevations of mountains and hills. The areas of depression between hills or mountains are known as valleys. A river in the mountains or hills will usually have a deep and steep V-shaped valley as the fast moving water cuts away at the rock as it flows downhill. Mountains form in different ways. Sometimes the crust has folded and buckled, sometimes it breaks into huge blocks. In both cases, great areas of land are lifted upwards to form mountains. Other mountains are formed by the earth's crust rising into a dome, or by volcanic activity when the crust cracks open.
http://www.answers.com/Q/Where_volcanoes_form http://www.answers.com/Q/Where_volcanoes_form http://www.answers.com/Q/Where_do_volcanoes_form http://science.nationalgeographic.com/science/earth/surface-of-the-earth/mountains-article/ http://science.nationalgeographic.com/science/earth/surface-of-the-earth/mountains-article/ http://www.primaryhomeworkhelp.co.uk/mountains/types.htm http://geography.about.com/od/physicalgeography/a/rivers.htm http://www.primaryhomeworkhelp.co.uk/mountains/types.htm
where do mountains usually form