Caves and Maines go only up to 1-2km inside the earth. Even the deepest wells of the world, such as the one 12km deep in the Russian kola penninusula or the 9km-deep one in the upper platinate, hardly scratch the earth's crust. One can "look "deep inside the earth 🌎in the aftermath of earthquakes or by creating nuclear explosions. The explosions generate sound or seismic waves. They also throw off rock particles. By measuring their intensity and timings,scientists discover the composition of the earth 🌎interiors
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