Mountain Building

Chapter 20

Isostatic Rebound – crust rises as a result of __________________

This iceberg demonstrates the process of isostatic rebound.

removal of mass

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

Examples: Aleutian Islands, Phillipines,______

Basaltic magma

trench

Volcanic island arc

Japan

Ocean-Continental Convergence

Examples: ________, Andes

Andesitic magma, granitic intrusions

volcanic mountains

trench

metamorphic rock

Cascades

Continental-Continental Convergence

Examples: Himalayas,______________

faults

folded mountains

igneous intrusions

metamorphic and sedimentary rock

Appalachians

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

Example:

intrusive rock

pillow basalts

Mid-Atlantic Ridge

Volcanic Hot Spot Mountain

Example: ______, Galapagos

extrusive ingneous rock

Hawaii

Uplifted Mountains

Example: ____________

intrusive igneous rock, less structural deformation

Adirondacks

Fault-Block Mountains

Example: __________, Basin and Range

mostly sedimentary rock

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 spot600-700 million

folded

volcanicexplosive