Using tongs, remove the hot marbles and place in a container of icewater. Marbles will immediately shatter. Rocks should crack. To demonstrate Organic Weathering, observe seed roots as they grow in dirt. Take a walk around the school grounds and observe places where tree roots have created cracks or areas of upheaval in sidewalks, streets or the parking lot.
Physical erosion is caused by wind and water .
To demonstrate, the teacher should dig up a piece of sod from the school yard and place it in an aluminum cake pan. To conduct this experiment, both pans should be inclined at an identical angle on a table, with a pan below each one to capture runoff. Sediments caught in each pan need to be dried out and weighed. The teacher might also want to repeat the experiment using pieces of sod with different types of soil and vegetation, since ground cover controls erosion. Chemical weathering can be demonstrated by pouring vinegar on a sedimentary rock.