Mountain Building Chapter 20

Isostatic Rebound – crust rises as a result of __________________ 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 __________.

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

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

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

Ocean-Continental Convergence volcanic mountains trench metamorphic rock Andesitic magma, granitic intrusions Examples: ________, Andes

Continental-Continental Convergence folded mountains metamorphic and sedimentary rock faults igneous intrusions 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.

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

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

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

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

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.