Data from old Soviet weapons tests are helping scientists get a high-resolution look inside our planet. The molten “blobs,” as Science Alert dubbed them, lie at the boundary between the molten core and the mantle, about 1,800 miles below the Earth’s surface. While testing his invention with his financial backer and former student David Innes, the machine malfunctions and the pair end up burrowing deep into the earth to emerge in Pellucidar, a lush underground cavern filled with giant prehistoric creatures. Today, we split the innards of the Earth into three segments: the crust, which is the outer layer, between 5km and 75km thick, the mantle, extending to a depth of around 2,900km, with the thickness of the core – the bit we’re interested in here – extending around 3,500km out from the Earth’s centre, with two distinct segments. https://www.goodreads.com/book/show/215950.At_the_Earth_s_Core Seismologists continue to probe the inner core. The Project Gutenberg EBook of At the Earth's Core, by Edgar Rice Burroughs This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. The magnetic field is generated by the spin of the inner solid core. The problem is hard to attack because seismic waves have to go pretty much straight from an earthquake, right through the Earth's center, to a seismograph. Dr. Abner Perry has invented a high-calibration digging machine affectionately called 'The Iron Mole'. Earth's inner core is doing something weird. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface. The time of inner core crystallisation is one of the most difficult questions to answer in Earth and planetary sciences. The core's eastern hemisphere appears to differ from the western hemisphere in the way the iron crystals are aligned. The Earth's core consists mostly of a huge ball of liquid metal lying at 3000 km beneath its surface, surrounded by a mantle of hot rock. The transition between the inner core and outer core is located approximately 5,150 km (3,200 mi) beneath the Earth's surface. https://www.edgarriceburroughs.com/.../the-pellucidar-series/at-the-earths-core (The mantle, which makes up most of the Earth’s interior, is mostly solid and exists between the core and the crust. Free kindle book and epub digitized and proofread by Project Gutenberg. Introducing you to some of our classic favourites... At The Earth's Coreby Edgar Rice Burroughs (1914) Narrated by Jason Kenyon Earth's outer core is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Earth's core started as entirely liquid metal and has been cooling and partially solidifying over time. Are helping scientists get a high-resolution look inside our planet 2,890 km ( 1,800 mi ) beneath the 's! 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