Educ 512 mountains and volcanoes presentation

PowerPoint Presentation

Mountains & volcanoesChapter 10

Folded Mountaina mountain that forms as continental crust crumples and bends into folds

Vocabulary

Fault Block MountainMountains that form as blocks of rock move up or down along normal faults

volcano

An opening in Earths crust where molten rock, rock fragments and hot gases erupt

Lava

Magma that has reached Earths surface

Pyroclastic Flow

a dense cloud of superhot gases and rock fragments that races downhill

Acid rainRain that contains large amounts of acid

geyserA type of hot spring where water shoots into the air

10.1Movement of Rock Builds Mountains

SubductionSome sea-floor material scrapes off the sinking plate an onto the continentMaterial once at the bottom of the ocean can be pushed up. 10.1

Mountain Ranges and BeltsSingle mountains are rareRanges close together form a belt

Example: Rocky Mountain belt (about 100 ranges)

10.1

Mountains Wear downIf mountains are pushed up faster than they wear down then they will grow tallerWater and wind break rocks apart and move pieces away. The pieces are called sediments. Land becomes flat

Mountains can form as rocks fold

Example: HimalayasConvergent boundary developedContinental crust beganCollision continues

Mountains can form as rocks move along faultsFault-block mountainsLithosphere stretched, crust breaksLithosphere can arch upSome blocks tilt up and form mountains and tilt down to form valleys

Questions To Discuss with a partner

The Ural Mountain Belt is no longer along the edge of a tectonic plate. Would you expect the Urals o be tall and steep or low and rounded? Why?

How could it be possible for a mountain range to be continually pushed up but not get any higher?