Question

millions of years ago, tiny marine organisms died and sank to the ocean floor. over time, their remains decomposed into organic matter. this organic matter was buried deep underground, where intense heat and pressure transformed it into petroleum. the petroleum then became stuck in geologic traps and collected in reservoirs, from which humans have extracted it. which pieces of evidence support the claim that petroleum mostly formed in places that were once oceans? select all that apply. petroleum formation involves intense heat from earths mantle and pressure from millions of tons of overlying rocks and sediments. petroleum reservoirs are often found within geologic traps capped by non-permeable rocks. petroleum is chemically similar to the remains of marine organisms like bacteria, algae, and plankton. petroleum reservoirs are often found in sedimentary rocks that formed in ancient marine environments.

Explanation:

• The first option only mentions heat and pressure for petroleum formation, not ocean - related evidence.
• The second option talks about geologic traps, not directly about ocean - origin.
• The third option shows chemical similarity to marine organisms, which supports ocean - origin.
• The fourth option mentions sedimentary rocks from ancient marine environments, which also supports ocean - origin.

Answer:

C. Petroleum is chemically similar to the remains of marine organisms like bacteria, algae, and plankton.
D. Petroleum reservoirs are often found in sedimentary rocks that formed in ancient marine environments.