Question

which of the following scenarios would be classified as both a point source and create immediate environmental effects?
gradual seepage from an old landfill over several years
fertilizer runoff from multiple farms during spring planting
a burst sewage pipe releasing waste directly into a creek
salt and oil washing off highways during winter storms
which statement best explains why both point and nonpoint source pollution can cause toxic algae blooms?
algae blooms are natural and unrelated to human pollution sources
both types release the same specific chemicals that directly create algae
only point sources cause algae blooms; nonpoint sources prevent them
both can introduce excess nutrients that promote rapid algae growth
period
1a
2a
3a

Explanation:

For the first question:

• A point - source pollution has a single, identifiable source. A burst sewage pipe is a single source (point - source), and releasing waste directly into a creek will have immediate environmental effects (like oxygen depletion in water, harm to aquatic life).
• Gradual seepage from a landfill is non - point (diffuse source) and over several years (not immediate). Fertilizer runoff from multiple farms is non - point (multiple sources). Salt and oil washing off highways is also non - point (diffuse, from the whole highway surface).

For the second question:

• Algae blooms are related to human pollution. Both point (e.g., sewage treatment plant discharge with nutrients) and non - point (e.g., fertilizer runoff) sources can introduce excess nutrients (like nitrogen and phosphorus). These nutrients promote rapid algae growth (eutrophication), leading to algae blooms. It's not that they release the same specific chemicals to 'create' algae (algae already exist in water, just grow rapidly with nutrients), and non - point sources do not prevent algae blooms.

Answer:

First question: C. A burst sewage pipe releasing waste directly into a creek
Second question: D. Both can introduce excess nutrients that promote rapid algae growth