Question

which water source may become polluted as it travels over land?
ponds
groundwater
oceans
runoff

Explanation:

To solve this, we analyze each option:

• Ponds are still or small - bodied water, not traveling over land.
• Groundwater is underground, not traveling over land.
• Oceans are large water bodies, not traveling over land.
• Runoff is water that flows over the land surface. As it moves over land, it can pick up pollutants like chemicals, debris, and soil contaminants, so runoff may become polluted as it travels over land.

Answer:

D. runoff