Question

why is petroleum unevenly distributed across the world? complete the sentences. the places where petroleum has been found must have once been ____ with abundant microorganisms, and they must have the types of rocks needed to form the _____ that often contain petroleum reservoirs. places that do not meet these two criteria are ____ to have petroleum reservoirs. oceans... sediments... likely oceans... geologic traps... unlikely continents... sediments... unlikely continents... geologic traps... likely

Explanation:

Petroleum forms from the remains of ancient microorganisms. These microorganisms were abundant in oceans. Geologic traps (specific rock formations) are needed to contain petroleum reservoirs. If a place lacks either abundant ancient microorganisms (from ocean - like environments in the past) or geologic traps, it is unlikely to have petroleum reservoirs.

Answer:

oceans...geologic traps...unlikely