1. If a and b denote the vectors OA and OB, indicate on the same diagram the vectors OC and OD denoted by a + b and a − b. Draw on another diagram the vectored
OE

denoted by a + 2b.

When a rock is mechanically weathered, the surface area of the rock is increased, which allows a greater amount of chemical weathering to occur. the surface area of the rock is increased, which hinders chemical weathering. the volume of the rock is decreased, which hinders chemical weathering. the volume of the rock is increased, which allows a greater amount of chemical weathering to occur. the surface area of the rock is decreased, which allows a greater amount of chemical weathering to occur