will result in an eruption . Websites used: http://wiki.answers.com/Q/Why_do_volcanoes_erupt&isLookUp=1 http://answers.yahoo.com/question/index?qid=20100216071935AA2o0O5 2. Why is lava red? Lava is red because anything that's 1200 to 1400 degrees Fahrenheit will turn red. The molten lava in the volcanoes are usually really hot and fresh. It will often be hot so it will appear rather