The molten metal core of the earth is slowing down and will eventualy stop, and the magnetic field of the earth, which is driven by the spinning core, is dying as well. This is a very bad thing, since it is the magnetic field of the earth that deflects large ammounts of radiation and radioactive particles from entering our atmosphere. The main characters build and pilot a vessel capable of drilling in to the center of the earth, where they have a plan to dettonate a nuclear device whose shockwave will hopefully jump start the earth's core. Thing's don't go as well as planned, and our heroes have to race against time to find a solution while the military on the surface plans to use "plan B," a plan that is less likely to fix the core, and will also kill our heros in the process.
Factual error: The geodes occurring in the mantle during the film are impossible in two ways. Firstly, there are no gaps at those depths. The pressure is approximately 3.5 million times surface pressure, and it is not feasible that such structures could form, let alone be maintained. Secondly, the crystals inside the geodes are described as amethysts. Amethysts are a purple variety of quartz, and as any undergrad geology student could tell you, there is no quartz in the mantle, it simply is not stable at such high temperatures.
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