The drilling of offshore oil fields and the shipment of petroleum by tankers sometimes result in oil spills that pollute the ocean, contaminate beaches, and kill wildlife.
(The drilling of offshore oil fields and the shipment of petroleum by tankers; result; in oil spills; T:sometimes) (oil spills; pollute; the ocean)
The drilling of offshore oil fields and the shipment of petroleum by tankers oil spills
result pollute
in oil spills T:sometimes
the ocean