Weathering: The Erosion of Rock by Natural Forces

The physical, biological or chemical factors that erode rock, from sand to ice, rain to plants, and even footsteps. Earth Science - Geology - Learning Points. "Weathering" refers to the breakdown of rocks into smaller pieces. Physical weathering occurs as wind, water and smaller rock particles scour exposed rock surfaces. Chemical weathering occurs as a result of weak acid in the atmosphere and rainfall reacting with rock forms. Biological weathering is caused by living creatures, e.g. plant roots, barnacles and sea urchins all bore into rocky surfaces. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.