True or false: Runoff and erosion are not sources of surface water contamination by pesticides.

Runoff and erosion are significant contributors to surface water contamination by pesticides. When pesticides are applied to agricultural fields or landscapes, they can be carried away from the application site by rainwater or melting snow, leading to runoff. This runoff can transport pesticides into nearby streams, rivers, lakes, and other bodies of water, where they can harm aquatic life and affect human health.

Erosion also plays a role, as soil particles that have adsorbed pesticides can be carried off by wind or water, again leading to contamination of surface water bodies. This movement of pesticide-laden soil contributes to the overall load of contaminants entering these waters.

Given this context, it's clear that the statement claiming runoff and erosion are not sources of surface water contamination by pesticides is incorrect, making the answer false. Understanding the mechanisms by which pesticides can reach surface water is crucial for implementing effective management practices and minimizing any adverse environmental impacts.