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.
Auto Makers label cars a year ahead as common practice due to release dates. A car made in 2016 will be released in 2015, but will often be fine tuned and made in the later part of the year. Most cars have to have time to be delivered to dealerships, tested and marketed as such, so the final product may take some time to get to you.