Tarballs are dark-colore sticky balls of oil formed from crude oil floating on the surface of the ocean. They are formed by the weathering of crude oil in marine environments. The sea currents and waves transport them from the open ocean to the seashores.
Tarballs are formed when oil slick undergoes physical, chemical and biological changes in the open ocean. They are found in shores of Indiaâ€™s western coast especially during the monsoon because of the wind speed and circulation. During this month, the Brihanmumbai Municipal Corporation (BMC) removed some 20,000 kg of tarballs from Juhu and Versova beaches.