Some evidence that support that Brazil is a wealthy country is that it has peace and forsworn nuclear weapons. Brazil have as low Notional debts. It also stated that it has full employment and low inflation. Those are some reasons Brazil is a wealthy country.
One type of weathering is man made weathering. (For example) Humans may carve a rock or mine for minerals. Another type is natural weathering. This is when a river may push a rock or lighting may scratch a tree. That weathering is naturally occurring. Hope that helped!
They are close to the equator, another reason is because of the tropical maritime location, temperature changes throughout the region are generally small.