49. According to the passage, the Carboniferous period was characterized by (A) a reduction in the number of coal deposits (B) the burning of a large amount of coal (C) an abundance of plants (D) an accelerated rate of glacier formation

45. According to the passage, scientists used isotopes from the water of the ice core to determine which of following? (A) The amount of air that had bubbled to the surface since the ice had formed (B) The temperature of the atmosphere when the ice was formed (C) The date at which water had become locked in the glacier (D) The rate at which water had been frozen in the glacier

49. According to the passage, the Carboniferous period was characterized by (A) a reduction in the number of coal deposits (B) the burning of a large amount of coal (C) an abundance of plants (D) an accelerated rate of glacier formation

其他試題

49. According to the passage, the Carboniferous period was characterized by
(A) a reduction in the number of coal deposits
(B) the burning of a large amount of coal
(C) an abundance of plants
(D) an accelerated rate of glacier formation