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Who: Henry J. Kaiser and Gordon Kaufmann
What: is a concrete arch-gravity dam
When: between 1932 and 1936 during the great depression
Where :the hover dam is located at the Arizona- Nevada
Hoover dam was made to control the Colorado river and give water and hydroelectric power for the southwest
How: 3,250,00 cubic yards of concrete plus another million for the power plan intake towers and other support structures. concrete was transported on rain cars in large buckets while overhead cable wave systems lifted the buckets and lowered them to the forms.

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Who- chemical weathering is rocks being weather by exposer to wind rain or other organic liduids
mechanical making big rocks to small rocks falling rockmor grinding
what- mechanical weathering is the physical break down of rocks with each smaller part having the same properties as the original mainly caused by temp. and pressure changes. Chemical weathering is the break down of rocks caused by chemical reactions.
why-- this happens because the rocks are being broken down.
how-- the rocks break down by the changes of temp. and pressure, and by chemical reactions.
when-  Chemical weathering is present when rain water reacts with the mineral grains in rocks. Mechanical weathering occurs whenever one rock hits another. Water then enters a crack, expands as it freezes, and wedges the rock apart.
where- near or at the crust of the earth.

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Who- the engineers for the dam where Benjamin Baker, Maurice Fitzmaurice and architect Walter Jurecka.
What- it is a 364 ft. down dam
When-  it was being constructed in 1960 and open on July 21, 1970.
Where- The Aswan Dam is located in the Nile River in Egypt.
Why- Valuable irrigation during droughts.
How-  built because do to flooding in the area

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Who- James Hutton discovered erosion, he was 57 years old, retired, and an amateur geologist
What- Erosion is the process of Earth being worn away, often by water, wind, or ice.
When- James Hutton discovered erosion in the 1780's.
Where- Erosion takes place in rivers, canyons, mountains, etc. Some examples are the Grand Canyon and the Colorado River.
Why- Happens when weathering occurs, overtime destruction to different types of landforms.
How- Wind causes erosion by blowing sand onto rocks and soil, breaking it down over time.
Glaciers cause erosion by moving slowly over land, carving out the land. Water causes erosion by washing away sediment and moving it to other locations.

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Who- Animals and rain contribute to building soil
What- process where the breakdown of rocks and organic materials create farmable land
When- Ancient soil fertilizing technique
Where- Wet climates are the best place to be used in
Why- invented to speed up process of growing crops
How- Organic material in the soil helps feed the plants

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Who- The need for the dam was mentioned by Chairman Mao
What- The world's largest hydropower project
When- Construction began in 1994 and ended in 2003
Where- Yangtze river near Sandouping Town in Yichang City, Hubei Province
Why- To generate electricity, prevent flooding, and allow ships to travel up and downstream.
How- Over 80 thousand sticks of dynamite used, engineers worked nonstop, and there were always people working 24 hours a day.