How is the environment affected by a large-scale oil spill?
a. large-scale oil spills are the largest contributor to air pollution.
b. large-scale oil spills lead directly to wetlands becoming deserts.
c. large-scale oil spills are damaging to water quality, aquatic life, and bird populations.
d. large-scale oil spills can lead to an increase in sea levels through glacial melting.

The correct answer is - c. large scale oil spills are damaging to water quality, aquatic life, and bird populations.

Oil spills are very big disasters that affect the environment and the ecosystems in the worst way possible. The water is contaminated to a degree where it can not be used for anything, and the oil it self needs lot of time to dispose so that the water returns to its previous state. The aquatic life dies out rapidly, all of the species affected by this die out of poisoning and the ecosystem in that place is totally ruined. The sea birds are also affected heavily because they dive into the water to hunt, and when there's oil their wings and bodies get covered in it and they are not able to fly, and either drown or slowly die on the shores.

c.) slabs of ocean floor return to the mantle in subduction zones.

answer; (d) melting of sea ice;