GENERAL GEOLOGY

Detailed explanation-1: -The scuffing of a shoe, cracks in a sidewalk, or the chipping of glass in a gravel-spattered windshield are all examples of physical weathering.

Detailed explanation-2: -Mechanical Weathering Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock.

Detailed explanation-3: -Chemical weathering changes the composition of a mineral to break it down. Water chemically weathers rock in hydrolysis. Carbon dioxide chemically weathers rock by creating acids. Oxygen chemically weathers rock by combining with a metal.

Detailed explanation-4: -Trees put down roots through joints or cracks in the rock in order to find moisture. As the tree grows, the roots gradually prize the rock apart. Many animals, such as these Piddock shells, bore into rocks for protection either by scraping away the grains or secreting acid to dissolve the rock.