Beginning in the mid 1600's Earth entered into a mini-ice age. 1815 was known as the "year without a summer" and snow fell in many European countries during the summer months. The year without summer was believed to be the result of a major volcanic eruption, Mount Tambora. Although the exact cause of the mini ice age is unknown, scientists speculate that the low temperatures correspond with A) very low sunspot activity. Eliminate B) the industrial revolution. C) increased greenhouse gases. D) a growing hole in the ozone.