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题库 / GMATLA-2PA-10
Rock varnish is typically rich in iron and manganese, with the presence of manganese due to bacteria on the surface of the rock. Because the bacteria would not survive on the surface of rocks in the colder, continuously frozen, reaches of Antarctica, scientists were not surprised to discover that rock varnish in the Thiel Mountains area of Antarctica consists only of limonite, a form of oxidized iron. This had penetrated from the surfaces of the rocks into the cracks. However, although moisture is essential to the movement of limonite, snow has not melted in the Thiel Mountains in recent times.
Indicate which statement in the table the given information most strongly suggests is true, and the statement that the given information most strongly suggests is false. Make only two selections, one in each column.
Rock varnish is typically rich in iron and manganese, with the presence of manganese due to bacteria on the surface of the rock. Because the bacteria would not survive on the surface of rocks in the colder, continuously frozen, reaches of Antarctica, scientists were not surprised to discover that rock varnish in the Thiel Mountains area of Antarctica consists only of limonite, a form of oxidized iron. This had penetrated from the surfaces of the rocks into the cracks. However, although moisture is essential to the movement of limonite, snow has not melted in the Thiel Mountains in recent times.
Indicate which statement in the table the given information most strongly suggests is true, and the statement that the given information most strongly suggests is false. Make only two selections, one in each column.
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Moisture is required for the presence of significant amounts of manganese in the environment.
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Moisture is not required for the presence of significant amounts of manganese in the environment.
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When temperatures in a continuosly frozen location increase to above freezing, cracks in rocks there begin to take in rock varnish containing significant amounts of manganese.
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Rock varnish that is especially rich in iron is mostly found in extreme cold.
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Manganese is unable to penetrate into cracks in significant amounts.
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Temperatures on rocks in the Thiel Mountains were above freezing at some point in the past.
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gmat club上说答案为FC
Rock Varnish里面含有两部分，iron和manganese,iron的形成需要湿度，manganese的形成需要bacteria，也就是需要温度高。
C选项说温度升高到零度以上，rock crack里将会形成rock varnish，并且rock varnish里含有大量manganese。含有大量manganese的说法是错误的，因为rock在低于零度的时候不会产生manganese，温度刚变高可能会产生manganese，但绝不会是大量的。
E选项说这座山曾经的温度高于零度是正确的，因为雪在零度以上才会融化产生一定湿度形成rock varnish里的limonite，既然这里发现了李莫尼特，而现在雪又没有停，必定是由于之前温度高于零度带来的湿度形成的。
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