Erosion and Weathering

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Presentation transcript:

Erosion and Weathering

From Last Class… Part 1 and 2 SHOULD be completed by now, and working on part 3 Suggested due date for part 3- End of class tomorrow Option to take home folder at end of class tomorrow Part 4/FINAL due date is THURSDAY JUNE 15th! NO LATER! NO EXCEPTIONS!

Erosion and Weathering Erosion: the wearing away and transport of the Earth’s materials 3 Major forms: Mechanical Erosion: water, wind, ice Chemical Erosion: chemicals in atmosphere/water Biological Erosion: Living things

Erosion by Water Occurs slowly or suddenly, can be gradual like streams/rivers through rocks; or quickly like overflowing rivers to break down riverbank Called Mechanical Weathering: sand particles carried by water hit rock and wear away more pieces

Erosion By Wind Another form of Mechanical Weathering Can erode soil and rock Wears away at the top level of soil (gets picked up by wind) as well as rock that it beats against Wind blown particles such as sand or soil wear away the rock

Erosion By Ice Another form of mechanical erosion By larger masses of ice (such as glaciers) and by small droplets of ice (seeping into cracks) Glaciers: Slowly moving and drifting down mountainside, wears away at rock layer beneath Glaciers can also melt which pulls rock with it into large piles called moraines Ice Droplets: water can seep into cracks and crevices of rock/land surfaces As water freezes it expands, which puts pressure on the surrounding rock and causes it to widen

Erosion by Chemicals Also known as Chemical Erosion Occurs when chemicals dissolved in water, rock & air REACT with the rocks Causes the rocks to change chemical make up Acid rain is a huge culprit of chemical erosion (due to pollution dissolved in air and then in rain droplets) Many sculptures have been worn away for this reason

Erosion by Living Things Also known as Biological Erosion Lichen (a fungus/plant) grows on rock, uses minerals in the rock as its source of nutrients Makes an acid that wears away the rock When it dies it leaves a thin layer of dead material that becomes soil for other living things Cracks in rocks can become home to plants and trees whose roots will penetrate into rock to find water and nutrients that can break off pieces of rock