What is oil pollution? What are its impacts on the marine ecosystem? In what way is oil pollution particularly harmful for a country like India?

Recently, oil pollution at the Kochi coast and earlier at Peru border due to Tonga earthquake-volcano highlighted the menace of oil pollution as a disaster. Oil Pollution: Oil pollution has three branches: - Marine oil leakages (Lami-Peru) - Ground water leakages (?) Uizog plant - Local usage systems RIC Impacts on marine ecosystem: (1) Reduced availability of oxygen (2) Increased biological oxygen demand