The Mystery Beneath The Crust – Explain?

1.	The Mystery Beneath The Crust – Explain?
Answer» When we look upwards, we can see into space for millions of kilometers. But, when we try to penetrate downward (by boring) we can only reach down to a land depth of about 4.3 km (14,000 feet). Thus, TILL today, man has only been able to scratch the surface of the planet, but has only penetrated up to such a minute depth — which is even less than 0.001 % of the distance from the surface to the centre of the earth. The Mohole Project was taken up by American scientists with the aim of improving our KNOWLEDGE of the sub-crust. The scientists planned to drill a hole, about 10 km deep, from the surface, through the crust to the material below. However, the project turned out to be so expensive that it was eventually abandoned after the early work. Later, much deep sea drilling was done and cores of ocean crust from sites of structural INTEREST were OBTAINED (D.S.D.P. or Deep Sea Drilling Project, and the I.P.O.D. or International Phase of Ocean Drilling Programmes). Valuable information was obtained regarding the behaviour of the earth’s crust and the rocks beneath. We do not know exactly what LIES beneath and what kind of conditions prevail in the earth’s interior. The geologists have intelligently interpreted the various kinds of evidence and tried to tell us about the composition, structure and nature of the earth.

Answer»

When we look upwards, we can see into space for millions of kilometers. But, when we try to penetrate downward (by boring) we can only reach down to a land depth of about 4.3 km (14,000 feet). Thus, TILL today, man has only been able to scratch the surface of the planet, but has only penetrated up to such a minute depth — which is even less than 0.001 % of the distance from the surface to the centre of the earth.
The Mohole Project was taken up by American scientists with the aim of improving our KNOWLEDGE of the sub-crust. The scientists planned to drill a hole, about 10 km deep, from the surface, through the crust to the material below. However, the project turned out to be so expensive that it was eventually abandoned after the early work.
Later, much deep sea drilling was done and cores of ocean crust from sites of structural INTEREST were OBTAINED (D.S.D.P. or Deep Sea Drilling Project, and the I.P.O.D. or International Phase of Ocean Drilling Programmes). Valuable information was obtained regarding the behaviour of the earth’s crust and the rocks beneath.
We do not know exactly what LIES beneath and what kind of conditions prevail in the earth’s interior. The geologists have intelligently interpreted the various kinds of evidence and tried to tell us about the composition, structure and nature of the earth.

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