The rock from under the surface and come to know whether oil is likely

The rock from under the surface and come to know whether oil is likely to be underneaththe rock3. To find out how deeply the oil is buried they need to know how far under the surfacethe rock is. If everything seems hopeful the men decide to drill down through the rock. Inthis way they find out whether oil really does lie underneath it. Often this test - well as itis called, is far away from any town and there is much work to do before any drillingstarts. Houses and roads must be built for the people coming to drill the test - wellThen the big dernick that carries the drill must be put up. This derrick is a strongframework of steel about 45 meters high. The drill is raised and lowered from inside thederrick.find the word that mean to make a hole from the above passage

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HAPPY happy

happy happy