Runoff is a part of the precipitation that appears to be uncontrolled and end up in surface streams , rivers and drains. Runoffs are known to carrying off top soil sediments which are carried while the stream flows into rivers ending up into other lands located far away. Other problem caused by runoffs is carrying of nutrients, bacteria and pesticides resulting into pollution.
That would be the Compound Microscope, it provides a high magnification that can visibly see movement in the cell, however, it has a low resolution. Hope it Helped!
