Answer: 3. Area of upwelling
Explanation: Wind blowing across the ocean surface push water away. So, water rises up from beneath the surface to replace the water which was pushed away. This process is called "upwelling". Waters that rises to the surface as a result of upwelling is typically colder and very rich in nutrients. These nutrients "fertilize" surface waters and so, these waters often have high biological productivity for fish to feed on.
Answer 4: Human activity
Explanation: The largest source of ocean pollution comes directly from land sources, such as oil, land, septic tanks, farms, ranches, motor vehicles, among others. Thousands of tons of waste and garbage are dumped into our oceans every day.
Answer 5: abrasives and polishes
Explanation: diatomaceous earth (Diatomaceous earth is the fossil remains of diatoms) has applications, among which can find: mild abrasive in hygiene products such as toothpaste or facial scrubs, liquid absorbent, porous support for chemical catalysts, anti-caking agent, dynamite stabilizer, thermal insulator.
