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.
Every year around March/April/May, TV manufacturers release new TV line-ups (and the old TVs are discontinued). This also means that you can find great deals on the old models in December/January/February/March as retailers are trying to clear stocks.