Correct answers are found through links located at the end of each question. The answer section is formatted for on-screen use, not printing, and will waste a lot of paper if printed directly. The fragments are then eroded, physically picked up by an agent such as a stream or a glacier. After they are eroded the materials are removed by transportation. Thus weathering must occur before erosion or transportation can take place.
Exfoliation is a specific type of mechanical weathering that occurs in granite.
Other types of weathering do occur and exfoliation is not necessary before erosion and transportation can take place. The ferromagnesian minerals contain iron, magnesium, and other metal ions in a silicate structure. Iron can react with oxygen to produce several different iron oxides, each with its own characteristic color. The most common iron oxide is hematite and has a deep red color. It is the presence of such iron oxides that color many sedimentary rocks and soils.