Mountain Building Chapter 20

Isostatic Rebound – crust rises as a result of __________________ removal of mass This iceberg demonstrates the process of isostatic rebound.

Folded rock layers produced by compressional forces Folded rock layers produced by compressional forces. This part of the folded mountain shows a __________. syncline

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 Andesitic magma, granitic intrusions Examples: ________, Andes Cascades

Continental-Continental Convergence folded mountains metamorphic and sedimentary rock faults igneous intrusions Appalachians Examples: Himalayas,______________

Nonconvergent-Boundary Mountains The next four slides show mountains formed at divergent boundaries (plates moving _____), hot spots, and areas of faulting or uplift. apart

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

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

Uplifted Mountains Adirondacks Example: ____________ intrusive igneous rock, less structural deformation Adirondacks Example: ____________

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

Mountain Building Review The Galapagos 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