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How do we discover inside the Earth?
The Continental Deep Drilling, near the Bavarian city of Weiden, drilled a hole around 9 KM deep in an old mountain. The drilling rig was over 80 m high.
Caves and mines go only up to 1-2 km inside the Earth. the deepest wells of the world, such as the one 12 km deep in the Russian Kola Peninsula or the 9-km-deep one in the Upper Palatinate, hardly scratch the Earth's crust. One can 'look' deep inside the Earth in the aftermath of earthquakes or creating nuclear explosions. the explosions generate sound or seismic waves. They also throw off rock particle. By measuring their intensity and timings, scientists discover the composition of the Earth's interiors.
(Did you know that)
More than 2200 years ago, the Greek discovered that the Earth is round. They even calculated an almost circumference of the Earth
The Earth is not a perfect globe. It's circumference at the equator is 40,077 KM whereas measured over the poles, it is 68 KM less
'Atmosphere' is a Greek word which means 'ball of vapour'
About 3000 ago people believed that the Earth was flat. But people wondered why ships disappeared at the horizon. Sailors too returned from journeys and were proof that ships did not fall off the edge of the Earth. The simplest explanation was: the Earth must be round. The final proof came in the year 1522 after the expedition of Ferdinand Magellan, who was the first to sail around the Earth.
