This entity exists on each of the terrestrial planets, as well as at least 3 different moons. Most of them--including Earth's--are primarily composed of silicate rock, but Triton has one made of ice. The Kola Super Deep Borehole took 20 years to dril
This entity exists on each of the terrestrial planets, as well as at least 3 different moons. Most of them--including Earth's--are primarily composed of silicate rock, but Triton has one made of ice. The Kola Super Deep Borehole took 20 years to drill here. Subduction occurs when a tectonic plate of the Earth is pushed into this layer, which had upper, lower, and transition zones. For 10 points, name this layer of a planetary body that lies below the crust but above the core, and is typically molten.