Why might farmers in brazil who get their fields by clearing rainforest need to clear new fields after only a few years?

There are abundant amount of Tropical rain forests found in Brazil. However, there is a problem these tropical rain-forests pose to the farmers who are growing their crops and vegetables in the area after clearing the forests.

If we talk about tropical rain forests their soils are not extremely nutrient rich throughout the soil area. Only a top layer of few centimeters contain good amount of nutrients that can support the life of growing plants. So when the farmers clear forest and grown plants , the nutrients are used by plants and after harvesting the crops , the soil is not able to use after only few years. This is because frequent wind and rain erode half of the nutrients from the soil surface and other half are used by plants , thus they cannot provide the nutrients to the crop just after few years.

Therefore, farmers need to clear the rain forests again for growing crops after a few years and this cycle goes on.

Hope it helps!

answer: glucoamylase presented optimum activity at temperature of 55â°c, and, in the glycosidic bonds from the non-reducing ends of starch, resulting in the production of glucose. source and type of fermentation can affect the enzyme's properties

credit to kalahira

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: