the rock from under the surface and come to know whether oil is likely to be underneath
the rock
3. To find out how deeply the oil is buried they need to know how far under the surface
the rock is. If everything seems hopeful the men decide to drill down through the rock. In
this way they find out whether oil really does lie underneath it. Often this test - well as it
is called, is far away from any town and there is much work to do before any drilling
starts. Houses and roads must be built for the people coming to drill the test - well
Then the big dernick that carries the drill must be put up. This derrick is a strong
framework of steel about 45 meters high. The drill is raised and lowered from inside the
derrick.
find the word that mean to make a hole from the above passage
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