MOLTEN ROCK, or magma, and gasses spew from the mouth of a volcano in the Hawaiian islands. As rock inside the earth melts, its mass remains the same while its volume increases--producing a melt that is less dense than the surrounding rock. This lighter magma then rises toward the surface by virtue of its buoyancy.
Although each automobile dealer has the option to release new models at a time it chooses, most companies release new models between September and December every year. In addition, some brands are showcased earlier in summer car shows.
Also, a little more 2016 cars will probably be out by Spring of 2015 just like some 2010 models were out in spring of 2009, but only a handful of 2016's will be released by the spring of 2015 and most of them won't be out until fall of 2015. Source(s): http://en.m.wikipedia.org/wiki/Model_yea...