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Reading Comprehension

23. The term “above it” in line 19 refers to - (1) rock less than three kilometers deep (2) rock no less than three but no more than five kilometers deep (3) rock less than five kilometers deep (4) the drill used to make the borehole in Kola (1) the basalt layer begins at less than 7 kilometers deep (2) the granite layer is missing from the crust in the Kola Peninsula area (3) the sedimentary layer lies between 5 and 7 kilometers deep (4) portions of the Earth's crust are hotter than previously thought 24. The Kola Borehole revealed that -

25. A good title for this text would be -

(1) Investigating the Earth’s Interior (2) Deep Granite Layers in the Earth’s Crust (3) Improvements in Modern Drilling Technology (4) Achievements of Russian Geologists

TEXT 6

Lighting a fire inside an igloo may seem foolish. But the heat from a small fire or seal-oil lamp actually strengthens and insulates the structure.

Until recently, Eskimos built their snow homes not only as permanent dwellings but also as temporary shelters. Often, igloos were occupied for one night and then abandoned. This is not as wasteful as it may seem. In 45 minutes an experienced builder 5 could make an igloo large enough to house two people. The largest problem facing an igloo builder is to find the right kind of snow. It must be firm and compact but not too icy, and ideally, produced by a single storm; snow that has fallen on separate occasions will not hold together well. 10 form the base. Working from within the circle, he lays successive levels of blocks, creating a spiral that tilts inward until it forms a dome. The builder then fills any gaps with soft, fresh snow. The final task is to cut an opening and to shape a block of snow for a door. The house must then be “iced” to make it strong. With the door firmly in The builder uses a knife to cut blocks of snow, then arranges them in a circle to

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