Runoff from farms carry excess nitrogen into bodies of water like ponds,lakes and rivers. What environmental problem is created by excess nitrogen? Algae Blooms Increased evaporation Acid Rain Global Warming

## Step 1<br />The problem is asking about the environmental issue that is caused by excess nitrogen in bodies of water like ponds, lakes, and rivers. The excess nitrogen is carried into these water bodies by runoff from farms.<br /><br />## Step 2<br />Excess nitrogen in water bodies can lead to a process called eutrophication. This is a form of water pollution that occurs when a body of water becomes overly enriched with nutrients, leading to a dense growth of plant life and the depletion of oxygen.<br /><br />## Step 3<br />Eutrophication is often caused by runoff from the land, which carries fertilizers, sewage, and detergents into the water. These nutrients, particularly phosphorus and nitrogen, can cause a dense growth of plant life and the depletion of oxygen in the water.<br /><br />## Step 4<br />The dense growth of plant life, known as an algae bloom, can be harmful to the ecosystem. The algae can deplete the oxygen in the water, which can kill fish and other aquatic life.