The Mohorovicic discontinuity is strange region, and could hardly be more important to us

The paradox of planet Earth is that almost all of it is unknown. The European Space Agency has just underlined this with the most accurate gravimetric satellite map so far of a universal feature called the Mohorovicic discontinuity. This strange region – the Moho for short – is a kind of basement floor, 70km or so below the Himalayas, a trifling 10km or so below the ocean floor. It marks the boundary between the brittle crust of the continents and seabed, and the dense and very different mantle that makes up 68% of the planet. It could hardly be more important to us.