This is sometimes described as a separate innermost core, but this seems to overstate things as there is no obvious transition layer.)īeyond the core lies the mantle, the main body of the Earth which ferries the heat from the centre to the surface. There are hints that the composition slowly changes with depth. Apart from breeding the magnetic field, the core does not affect us: like our skeleton, it stays inside to provide stability. Of course it consists of iron and is outside rather than inside the solid part, but you get the idea. This protective role can perhaps be compared to that of bone marrow. As a byproduct these bubbles create the Earth’s magnetic field, which immunizes us from space weather. It consists of two parts, a solid, stable inner core and a liquid outer core in which the liquid moves around in huge convecting bubbles. The iron core acts as the Earth’s skeleton. From the outside to the core, our surgical cut reveals the crust (and/or lithosphere, if you prefer), the upper mantle, the lower mantle, the outer core and the inner core. Source To find the heart, we need to look below the surface. This story is about the search for the Earth’s heart. This is the Earth breathing – if you can imagine breathing solid rock. Plates subduct, refresh the Earth inside and the enriched mantle resurfaces as new oceanic crust. Continents drift, collide and separate oceans grow and wane mountains rise and fall. But speed up time, and you can see the Earth come to life. It is big enough not to have to worry about it. To be considered ‘alive’ an organism needs to meet some requirements (as defined by the powers-that-be): the ability to adapt to the environment, to respond to stimuli, to actively regulate its internal conditions, to produce energy by metabolism, to grow and reproduce. The version that is always quoted is in reality from the 1986 song Star Trekkin’. At least, no life as we know it.’ In another episode Spock comments about a strange creature ‘It is not life as we know or understand it. ( What Spock actually said was ‘there is no life, other than the accountable human residents of this colony beneath the surface. It is only a small step for humankind to apply it to an entire planet.
#Living earth west series#
Appropriately, the origin of this expression – slightly rephrased from the original Star Trek series – is from the second-most-famous non-human in existence, Spock, referring to a living rock.
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