Question

a farmer who lives beside a river raises livestock that produce lots of manure. the farmer shovels the manure into piles on the edge of her farm. how might this activity affect the local watershed?
the manure will likely wash with precipitation into the river.
the manure will likely infiltrate earths surface and contaminate the groundwater.
the manure piles will likely obstruct the rivers channels.
the manure will likely have no effect on the local watershed.

Explanation:

The farmer's manure piles are near a river. Precipitation (rain) can wash the manure into the river, affecting the watershed. Option 1: Manure washing with precipitation into the river is plausible as runoff from rain can carry manure. Option 2: Infiltrating Earth's surface to contaminate groundwater is less direct here (near river, surface runoff more likely). Option 3: Manure piles don't typically obstruct river channels. Option 4: Manure will have an effect, so this is wrong. So the correct option is the first one about manure washing with precipitation into the river.

Answer:

The manure will likely wash with precipitation into the river.