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3 Cards in this Set

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Commercial Farming (3.4)

The North American Prairies.




Problems that occurred-


*increase salinity


*soil erosion


*limit of water


How to solve-


*Leaving bare soil for long periods were stopped or reduced.


*Snow fences or barriers enabled snowdrifts to pile up which provide water then they melt in.


*contour ploughing and strip cropping.



Subsistence Farming (3.4)

As the Sahara advances and human population increases, there is more pressure on the land to produce enough food.




Method-


Putting stones in lines, along the contours of the land.


Difficulty-


Placing the stones along the contour line when the slope was shallow.


Solution-


Have a flexible transparent hosepipe filled with water.


align the water levels at each end of the pipe, and place stones accordingly.




Makes such a difference that seeds germinate in this moisture, rich organic soil and trees can be planted.

EIA Human Activity

Chernobyl - Ukraine, April 1986


Nuclear contamination


Human error-


poor supervision


Drawbacks with the reactor




Increase in thermal power led to the two non-nuclear explosions.


Distribution of airborne radionuclides across western Europe.




Result- Contamination of soil, plants and animals