Initially attracted to brazil by the prospect of gold and silver, the portuguese soon found to be extremely profitable.
a.
copper
b.
gambling
c.
diamonds
d.
plantations of sugar and coffee
e.
slavery

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

b.provides a written record of the transaction