Question

select the 2 most common sources of point source pollution affecting the oceans.

factories
runoff from lawn fertilizers
excess sediment from construction
sewage from sewage treatment facilities
runoff from farms
excess sediment from farms
discarded plastics

Explanation:

Define point source pollution

Using the Point Source Pollution knowledge point, point source pollution refers to contaminants that enter a waterway from a single, identifiable source, such as a pipe, ditch, ship, or factory smokestack.

Evaluate the given options

• Factories: These discharge pollutants directly into water bodies via specific pipes, making them a classic point source.
• Runoff from lawn fertilizers: This is a diffuse source carried by rainfall over land, which is nonpoint source pollution.
• Excess sediment from construction: This is diffuse runoff from land surfaces, classifying it as nonpoint source pollution.
• Sewage from Sewage Treatment Facilities: These facilities release treated or untreated wastewater directly into water bodies through distinct discharge pipes, making them a major point source.
• Runoff from farms: This is diffuse agricultural runoff, which is nonpoint source pollution.
• Excess sediment from farms: This is diffuse agricultural runoff, which is nonpoint source pollution.
• Discarded plastics: These are widely distributed marine debris from various diffuse land and ocean sources, classifying them as nonpoint source pollution.

Select the two most common point sources

The two options that represent distinct, identifiable discharge points are factories and sewage treatment facilities.

Answer:

• Factories (Correct answer)
• Runoff from lawn fertilizers
• Excess sediment from construction
• Sewage from Sewage Treatment Facilities (Correct answer)
• Runoff from farms
• Excess sediment from farms
• Discarded plastics