What are the four major regions of brazil?

Why does less erosion & more deposition take place on the outside bank of a meander?

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

Which of the following is evidence to the past existence of glaciers?