Journey to the Center of the Earth (2008 direct-to-video film) Earth's crust and into the very mantle of the Earth. This is where the operators encounter hidden dangers awaiting them at the Earth's core. The team has to deal with prehistoric creatures in order to both save the research team and to return safely to the surface of the Earth. Journey to the Center of the Earth (2008 direct-to-video film) Journey to the Center of the Earth (released in the UK as Journey to Middle Earth) is a 2008 direct-to-DVD film created by The Asylum and directed by David Jones and Scott Wheeler. The film is a loose adaptation of
Crust (geology) Mars comprise secondary crust, as do the lunar maria. On Earth, we see secondary crust forming primarily at mid-ocean spreading centers, where the adiabatic rise of mantle causes partial melting. Tertiary crust is more chemically-modified than either primary or secondary. It can form in several ways: The only known example of tertiary crust is the continental crust of the Earth. It is unknown whether other terrestrial planets can be said to have tertiary crust, though the evidence so far suggests that they do not. This is likely because plate tectonics is needed to create tertiary crust, and Earth is the