Eros i onEros i on

The process by which wind, water, ice or The process by which wind, water, ice or gravity transports (takes) soil and gravity transports (takes) soil and

sediment from one location (place) to sediment from one location (place) to another.another.

Wave Eros i onWave Eros i onThis happens when waves crash This happens when waves crash

against the shore. Following are some against the shore. Following are some pictures and descriptions of wave pictures and descriptions of wave erosion. erosion.

Sea StacksSea Stackswere once connected to the mainland. Waves have ERODED the were once connected to the mainland. Waves have ERODED the

mainland leaving behind columns of rock, standing all alone.mainland leaving behind columns of rock, standing all alone.

Sea ArchesSea Archesform when wave action continues to erode a sea cave, cutting completely form when wave action continues to erode a sea cave, cutting completely

through the rock.through the rock.

Sea cavesSea cavesform when waves cut large holes into weak rock along a sea cliff. form when waves cut large holes into weak rock along a sea cliff.

Wave DepositionWave Deposition

What is “Wave Deposition” you ask? Well…What is “Wave Deposition” you ask? Well…Waves carry a lot of stuff, including sand, rock Waves carry a lot of stuff, including sand, rock pieces, dead coral and shells. A lot of times, this pieces, dead coral and shells. A lot of times, this material is “deposited,” or left, on a shoreline, material is “deposited,” or left, on a shoreline, where it forms a beach.where it forms a beach.

Following are some examples of what waves Following are some examples of what waves have “deposited” on the shore. (“Wave have “deposited” on the shore. (“Wave deposition”)deposition”)

Beaches are made of different types Beaches are made of different types of material deposited by waves.of material deposited by waves.

Other types of water erosion…Other types of water erosion…

A river caused this beautiful valley in Hawaii to form.

The Grand Canyon…The Grand Canyon…ever been there?ever been there?The Grand Canyon was formed by moving water.The Grand Canyon was formed by moving water.

Wind Eros i onWind Eros i onHave you ever been working outside and had a gusty Have you ever been working outside and had a gusty

wind blow a stack of papers all over the place? If this wind blow a stack of papers all over the place? If this has happened to you, then you have seen how wind has happened to you, then you have seen how wind erosion works. Wind removes soil, sand, and rock erosion works. Wind removes soil, sand, and rock

particles and transports them from one place to another.particles and transports them from one place to another.

Wind ErosionWind Erosionthe grinding and wearing away of rock when blowing pieces of sand and the grinding and wearing away of rock when blowing pieces of sand and

rock rub against another rock surface.rock rub against another rock surface.

Wind DepositionWind Deposition

Ok, now that you know what wave deposition is, Ok, now that you know what wave deposition is, I bet you can guess what “wind deposition” is I bet you can guess what “wind deposition” is right?.....So…..what is it? right?.....So…..what is it?

LoessLoessfeels like baby powder! Loess forms when wind carries feels like baby powder! Loess forms when wind carries

material far away from it’s source. material far away from it’s source.

Sand dunesSand dunesform when a mound of wind-deposited sand keeps moving and keeping form when a mound of wind-deposited sand keeps moving and keeping

it’s shape at the same time, even though it moves.it’s shape at the same time, even though it moves.

Ice or Glacial ErosionIce or Glacial Erosion

Glaciers smooth the land by scraping and Glaciers smooth the land by scraping and eroding parts of the land that were there before eroding parts of the land that were there before the ice appeared.the ice appeared.

Glaciers also carve out rugged features in the Glaciers also carve out rugged features in the mountain rock through which they flow. mountain rock through which they flow.

Following are some example pictures.Following are some example pictures.

Alpine ValleyAlpine ValleyGlaciers carved out this rugged landscape in Switzerland.Glaciers carved out this rugged landscape in Switzerland.

By the way…By the way…

Mrs. Ambrosio took this photo of that same valley in Switzerland (from the other direction, obviously) from a cable car.

CirquesCirquesare examples of glacial erosion because glaciers cut into the are examples of glacial erosion because glaciers cut into the

back of the mountain.back of the mountain.

Glacial DepositionGlacial Deposition

So…tell me…what is glacial deposition? So…tell me…what is glacial deposition?

Glacial DriftGlacial Drifthappens when rock material is carried andhappens when rock material is carried and deposited deposited (there’s (there’s

that word again) by glaciers.that word again) by glaciers.

Not all changes in the earth are Not all changes in the earth are due to slow processes like due to slow processes like EROSIONEROSION. Some changes are due to . Some changes are due to rapid processes, like landslides, rapid processes, like landslides, volcanic eruptions and earthquakes!volcanic eruptions and earthquakes!

Following are some picture examples.Following are some picture examples.

LandslidesLandslideshappen when rock and soil suddenly move down a slope.happen when rock and soil suddenly move down a slope.

MudflowsMudflowshappen when mud or rock and soil mixed with a large amount happen when mud or rock and soil mixed with a large amount

of soil flow down a slope or hill.of soil flow down a slope or hill.

Volcanic EruptionsVolcanic EruptionsMt. St. Helens erupted on May 1, 1981. It definitely changed Mt. St. Helens erupted on May 1, 1981. It definitely changed

the land in the area.the land in the area.

Before…

After…

How do you think the eruption of Mt. St. Helens affected the surrounding land?