Studying volcanic eruptions can help investigate cooler temperatures on Earth because volcanic eruptions eject sulfur dioxide, which is converted to sulfuric acid in the atmosphere. This sulfuric acid forms aerosols that reflect incoming solar radiation back to space, leading to a cooling effect on the Earth's surface. Therefore, the correct response is:
"Volcanic eruptions eject sulfur dioxide, which is converted to sulfuric acid, which then reflects incoming energy from the sun back to space, therefore cooling the surface of Earth."