GEOLOGY

Detailed explanation-1: -Answer and Explanation: The correct answer is Nutrients.

Detailed explanation-2: -An overabundance of nutrients-primarily nitrogen and phosphorus-in water starts a process called eutrophication. Algae feed on the nutrients, growing, spreading, and turning the water green. Algae blooms can smell bad, block sunlight, and even release toxins in some cases.

Detailed explanation-3: -Phosphorus and nitrogen are essential to algae production, and these nutrients encourage the growth of algae in waterbodies. Phosphorus is the key nutrient limiting algal growth in the majority of BC lakes.

Detailed explanation-4: -The sources of nutrients poten-tially stimulating algal blooms include sewage, atmospheric deposition, groundwater flow, as well as agricultural and aquaculture runoff and discharge.

Detailed explanation-5: -Algal blooms can be dramatic and are a result of excess nutrients from fertilizer, wastewater and stormwater runoff, coinciding with lots of sunlight, warm temperatures and shallow, slow-flowing water.