Figure 2. The Ocean floor. Most Offshore Drilling for Oil and Natural gas takes place in the Continental Shelves (Source: Encarta Encyclopedia, 2009)

From

Benthic Studies and Environmental Assessment in the Oil Producing Area of the Niger Delta

C.I.C. Anyadiegwu, N. Uwaezuoke

American Journal of Environmental Protection. 2015, 3(1), 37-43 doi:10.12691/env-3-1-5