Features like the Grand Canyon are good examples of the power of water to . A. reduce erosion B. change course suddenly C. carve away sections of the land D. cause tremendous devastation by flooding

The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?