Tel: 024.7300.7989 - Phone: 1800.6947 (Thời gian hỗ trợ từ 7h đến 22h)

Giỏ hàng của tôi

Dạng bài Đọc hiểu lớp 12

The author states that offshore canyons and guyots have which of the following characteristic in common?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. 

     In addition to the great ridges and volcanic chains, the oceans conceal another form of undersea mountains: the strange guyot, or flat-topped seamount. No marine geologist even suspected the existence of these isolated mountains until they were discovered by geologist Harry H. Hess in 1946. He was serving at the time as a naval officer on a ship equipped with a fathometer. Hess named these truncated peaks for the nineteenth-century Swiss-born geologist Arnold Guyot, who had served on the faculty of Princeton University for thirty years. Since then, hundreds of guyots have been discovered in every ocean but the Arctic. Like offshore canyons, guyots present a challenge to oceanographic theory. They are believed to be extinct volcanoes. Their flat tops indicate that they once stood above or just below the surface, where the action of waves leveled off their peaks. Yet today, by definition, their summits are at least 600 feet below the surface, and some are as deep as 8,200 feet. Most lie between 3,200 feet and 6,500 feet. Their tops are not really flat but slope upward to a low pinnacle at the center. Dredging from the tops of guyots has recovered basalt and coral rubble, and that would be expected from the eroded tops of what were once islands. Some of this material is over 80 million years old. Geologists think the drowning of guyots involved two processes: The great weight of the volcanic mountains depressed the sea floor beneath them, and the level of these  a rose a number of times, especially when the last Ice Age ended, some 8,000 to 11,000 years ago.

Câu 56727: The author states that offshore canyons and guyots have which of the following characteristic in common?

A. Both are found on the ocean floor near continental shelves. 

B. Both were formed by volcanic activity. 

C. Both were, at one time, above the surface of the sea.

D. Both present oceanographers with a mystery. 

Câu hỏi : 56727
  • Đáp án : D
    (0) bình luận (0) lời giải

    Giải chi tiết:

    Sentence: "Like offshore canyons, guyots present a challenge to oceanographic theory. They are believed to be extinct volcanoes."

    Lời giải sai Bình thường Khá hay Rất Hay
Xem bình luận

>> Luyện thi TN THPT & ĐH năm 2024 trên trang trực tuyến Tuyensinh247.com. Học mọi lúc, mọi nơi với Thầy Cô giáo giỏi, đầy đủ các khoá: Nền tảng lớp 12; Luyện thi chuyên sâu; Luyện đề đủ dạng; Tổng ôn chọn lọc.

Hỗ trợ - Hướng dẫn

  • 024.7300.7989
  • 1800.6947 free

(Thời gian hỗ trợ từ 7h đến 22h)
Email: lienhe@tuyensinh247.com