Globalization and enviroment - G98 + G99

8 important questions on Globalization and enviroment - G98 + G99

What is Soil ersosion

the term for the gradual disappearance of the fertile top layer of soil. Soil can be washed away by water of blown away by wind.

Where is the risk of water-borne soil erosion the greatest ?

areas with a lot of relief

Why is there only a small change of water-borne soil erosion on places where vegetation grows on slopes?

the roots of trees, plants and grasses stop the soil from moving
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Where is the risk of wind-borne  soil erosion the greatest?

in dry regions, where the soil is dry and dusty and where there is very little vegetation

What happens when there is heavy rainfall and there are trees?

During heavy rainfall the canopies of the trees are like umbrellas. Drops of rain slide gently from the leaves onto the ground and sink into the earth. Rainwater that falls on slopes flows slowly  through the soil to a river in the valley.

What happens when the is heavy rainfall and the trees are cut down?

the rain can't fall onto the leaves anymore, so it falls straight onto the ground . the water then flows across the ground into the valley, taking along the loose sand (soil erosion)and floods

Find three differences between the Yangtze and the Huang He rivers in length, location and drainage?

Length: the Yangtze (6,480) is longer than the Huang He (5,464 km)
Location: the Huang He is in the dry north, the Yangtze is in the wet south.
water drainage: the Yangtze drains more water than the Huang He.

Why is the drainage highest in summer?

there is more precipitation in summer (dry winter)
there is more meltwater in summer

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