Art 2: Match the items in the first column with the correct descriptions in the second column. Reactions that take place, often facilitated by water, to new produce products, mainly clay minerals, which are stable at Earth's surface. The reaction of a substance (often a metal ion) with oxygen. Rust is an example. The breaking of rock into smaller pieces. When water freezes, it expands in volume. Water-filled cracks can be enlarged when this new ice exerts outward pressure on the walls of the fracture. The expansion of rocks that formed under high confining pressure, once they are uplifted and exposed at Earth's surface producing fractures that are broadly curved and parallel to the land surface. Pressure that is unequal in different directions, such as results from the convergence of tectonic plates (mountain-building). A substance that forms when carbon dioxide in the air combines with water. It is an important agent of chemical weathering. Pressure that is equal in every direction, such as results from the burial of sediments. A. Chemical weathering B. Oxidation C. Mechanical weathering D. Frost wedging E. Sheeting F. Differential stress G. Carbonic acid H. Confining pressure