Question

In prehistoric times volcanic eruptions caused mass extinctions of many species of marine organisms attached to the ocean floor. What is the MOST LIKELY reason for this? A) Volcanic eruptions change the pH and temperature of the ocean. B) In prehistoric times, there were very few species of marine organisms. C) In prehistoric times, most volcanic eruptions took place on the ocean floor. D) Volcanic eruptions remove all traces of dissolved oxygen in the waters of the oceans. Eliminate

Answer 1

Answer: A). Volcanic eruptions change the pH and temperature of the ocean.

Explanation:

Volcanic eruption from an oceanic floor likely to release gases, sediments which can be of high temperature. The sediements will increase the turbidity in the water and will change the pH and the high temperature may not be tolerated by plants and animals. This may be the result of extinction of many species of marine ecosystem.