Historical Evidence Flashcards

1
Q

Siltation from soil erosion in uplands resulted in sedimentation that clogged irrigation canals and depopulated cities

A

Bablylon/Iraq

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2
Q

Flooding of delta with sediment-rich water-maintained soil productivity for over 6000 years.

A

Nile Valley, Egypt

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3
Q

Villages in uplands were abandoned due to the loss of topsoil. Where terraces are present, some agriculture remains. The rate of abandonment of land reflects the loss of topsoil.

A

Judea/Israel

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4
Q

Topsoil lost by erosion. Area is depopulated desert.

A

100 Dead Cities/Syria

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5
Q

Forests of cedar cleared for agriculture on steep slopes. Soil erosion denuded of topsoil except where rock walled terraces built and maintained from bottom to the top of slopes.

A

Lebanon terraces

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6
Q

Mountains kept barren of cedars by grazing livestock

A

Lebanon livestock

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7
Q

Riverbeds built high above flood plain by deposition of silt eroded from headwaters, resulting in the risk of flooding and death.

A

China Yellow River

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8
Q

Gullies 600 feet deep caused by erosion

A

China Loess Plateau

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9
Q

Great agricultural areas with olive groves are now covered in wind deposits, overgrazing of vegetation, causing runoff and soil erosion, and lowering water table is likely cause.

A

Timgad, Algeria (North Africa)

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10
Q

Terraces have sustained production cultivation of 2500 years on slopes up to 100%.

A

Southern France

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11
Q

Large-scale deforestation since 1950’s resulted in serious damage to slopes and burying of rice fields in valleys.

A

China Forests

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12
Q

Experts in soil and water conservation. Built bench terraces 3-10 feet tall using stone.

A

Incas of Peru

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13
Q

Complex systems of bench terraces, dams and diversions.

A

Maya /Central America Southern Mexico

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