The core

Good and bad science in “the Core”
“The core” is a science fiction movie which talks about the end of the world. However, it is a science based film; it has many errors in the scientific part. Several reviews cited the numerous scientific inaccuracies in the film, saying that it was a mess. The most numerous errors were visible in the physics area. But also there were mistakes in the biologyarea.
The earth's interior was described and explained accurately in the movie. The main divisions are the: crust, mantle, outer core and inner core. It is true that the outer core is a rotating fluid, the composition of which is most likely dense iron and nickel. The inner core is solid. The crust we live on is the thinnest part of Earth and that it is the least dense rock. The Mariana Trench, thetrench from which they wanted to penetrate the earth in order to get to the core, is the deepest submarine trench as well as the deepest location in Earth's crust. This trench is not only closer to the ship's final destination but also a spot where the oceanic crust would be thinner and a ready-made crack.
Also the idea of the magnetic field around the world was correct. It isalso true that themagnetic field is generated by the rotation of the dense, iron, liquid outer core. The geomagnetic field protects us from harmful charged particles emitted by the sun.  

So, in reality, the outer core did not stop moving of its own accord. It was interfered with. Is it possible for people to control such a huge mass of hot fluid 2,900 km below earth's surface? Given today's technology, in aword, no.
As long as the outer core is rotating and generating the electromagnetic dynamo which creates the Magnetic Field, then there will be no break down, nor decay, of this geomagnetic protection. Of course, the premise in the film was that the outer core did stop moving. In that case, how would the Magnetic Field be generated? Once again, this is the fictitious part of the story.
Dr. Keyes isamazed by the huge crystals inside the large mantle geode, or as Keyes put it "Gem Bubble", in which Virgil broke down. Nimsky states the crystals are Amethysts. As stated in the section above, empty space in the mantle is dubious indeed. But, amethyst crystals at a depth where temperatures are 5,000-9,000°F? Amethyst is a variety of the mineral quartz, (silicon dioxide, SiO2). Bowen's ReactionSeries clearly indicates that the first mineral to melt, also the last to form, in a series is quartz. Quartz is stable at surface conditions and unstable under great pressure and at depth. How would quartz crystals withstand the 9,000 degree temperatures and tremendous pressure so deep inside Earth, even if there were a cavity in the mantle? Mantle rocks are mafic in composition. They are abundantin the minerals pyroxene and olivine and lacking in the minerals quartz and orthoclase feldspar. And so, quartz-rich crystal formations have no business growing in the mantle in the first place. Of course, the fictitious large crystals made it a gorgeous place to break down, albeit dangerous.
Molten rock begins to pour into the large geode where Virgil became stuck on a large crystal. Panic setsin and an immediate exit is critical. Dr. Serge Leveque says, "At this rate we have 2 minutes before the lava gets us".
Magma is the term for molten rock inside the earth and Lava is the name for molten rock when it flows on earth's surface. Therefore, the term lava was incorrectly used in this situation.
Heard in the Control Center:
" The 2 Terranauts Found a Space between 2 TectonicPlates Somewhere Near Hawaii"
Hawaii is located within one tectonic plate, the Pacific Plate. The Hawaiian Islands formed from Hot Spot Volcanism, an unusually hot area in the mantle which causes partial melting of the upper mantle and oceanic crust as a tectonic plate passes over it. The mantle is stationary but the plate moves. This results in volcanism that forms chains of islands (Volcanic Island...