The subject of this passage is the ____________.
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1 .The atmosphere consists of ___________.
A contains a layer of ozone gases B about 42 degrees colder than on the ground C 21% oxygen by weight D less than 1% of xenon by volume E about 75 degrees colder than in Interlaken F is warmed by the earth’s heat
2 .The troposphere is the warmest part of the atmosphere because it __________.
A contains a layer of ozone gases B about 42 degrees colder than on the ground C 21% oxygen by weight D less than 1% of xenon by volume E about 75 degrees colder than in Interlaken F is warmed by the earth’s heat
4 .The cause for the heat in the interior of the earth is __________.
A radioactive elements B the great pressure of the earth C not determined D the heat remaining from the formation of the earth
5 .From the information given in the passage, most minerals would melt fastest ________.
A at 4000℉, at sea level B at 4000℉, 5000 feet below sea level C at the exact center of earth at 4000℉ D at 4000℉, 5000 feet above sea level
