It helps keep air in and water from evaporating out. Mulch also keeps weeds from growing. When placing mulch on the ground place it 2 to 3 inches thick. A flood is a body of water that comes over dry land and carries topsoil away and leaves the land bare. Floods are usually harmful to people and homes.
Floods are sometimes helpful by making the land very fertile.
Seacoast floods usually kill hundreds of thousands of people, and destroy millions of homes. Seacoast floods usually result from hurricanes and big storms. A giant sea wave caused by an earthquake is called a Tsunami. Most rivers overflow once every two years. Too much rain at one time sometimes floods rivers.