Plate Tectonics Mountain Building

Plate Tectonics Mountain building is a process in which mountains are formed due to converging or diverging plates. Meaning that mountains are formed from plates colliding or moving apart.

Folded rock layers are produced by compressional forces when two plates collide. This part of the folded mountain shows a syncline.

Although the Mid-Atlantic Ridge is mostly an underwater feature, portions of it have enough elevation to extend above sea level. Iceland is part of the Mid-Atlantic Ridge. Therefore, Iceland was formed by diverging plates.

Example of new crust being formed at Iceland. _____ type volcano on the mid-Atlantic ridge. Sheild

Convergent-Boundary Mountains The following three slides show mountain types produced when plates move __________. together

Ocean-Ocean Convergence Volcanic island arc trench Basaltic magma Examples: Aleutian Islands, Phillipines,______ Japan

Ocean-Continental Convergence volcanic mountains trench metamorphic rock Explosive eruptions Examples: ________, Andes Cascades

Continental-Continental Convergence folded mountains metamorphic and sedimentary rock faults igneous intrusions Appalachians Examples: Himalayas,___________ , 600-700 million years

Divergent-Boundary Mountains The next three slides show mountains formed at divergent boundaries (plates moving _____), hot spots. apart

Divergent-Boundary Mountain pillow basalts intrusive rock Example: Mid-Atlantic Ridge

Volcanic Hot Spot Mountain extrusive ingneous rock Hawaii Example: ______, Galapagos

Fault-Block Mountains mostly sedimentary rock Example: __________, Basin and Range Grand Tetons

Mountain Building Review The Hawaiian Islands formed as a result of a ___________. The Appalachians are about _________ years old. The Appalachians are a __________ mountain range. The Cascades (Mt St Helens, Mt Rainier,…) are a ___________ mountain range with ___________ eruptions. hot spot 600-700 million folded volcanic explosive