Earth science is known as plate tectonics. Plate tectonics might be thought of as the process by which the Earth is resurfaced. As the result of seafloor spreading, new crust and lithosphere is created by the flow of magma from the mantle to the near surface, through fissures, where it cools and solidifies. Through subduction, oceanic crust and lithosphere returns to the convecting mantle. Areas of the crust where new crust is created are called "divergent boundaries", those where it is brought back into the Earth are "convergent boundaries" and those where plates slide past each other, but no new lithospheric material
Costing the Earth Costing the Earth Costing the Earth is a programme on BBC Radio 4 about the environment. According to the programme´s website, it looks at man's effect on the environment and how the environment reacts, questioning accepted truths, challenging those in charge and reporting on progress towards improving the world. The programme reports on all matters relating to the environment. The most recent series has covered topics as diverse as the impact of having a baby on the environment and Germany's energy revolution. Notably the series worked with BBC2's Newsnight programme and the BBC World Channel's Our World to produce a