Nhận biết (M1)

Blue holes, such as Watling’s Blue Hole near San Salvador Island, are large marine sinkholes. They are typically located in areas where the ocean bedrock is made of soluble material (e.g., marble) because rock erosion is crucial to their formation. Because of the diverse marine life they contain, blue holes attract numerous divers and scientists. Currently the Taam Ja’ Blue Hole in Chetumal Bay, Mexico, is the deepest blue hole on record, measured by Teresa Álvarez-Legorreta and colleagues to be at least 420 meters below sea level.

According to the text, what draws divers and scientists to blue holes such as Watling’s Blue Hole and the Taam Ja’ Blue Hole?

• A.

  A hope to encounter a variety of marine organisms

• B.

  A desire to witness the erosion of the rocks in the blue holes

• C.

  A commitment to protecting the marble and other soluble materials in the blue holes

• D.

  An interest in comparing the depths of Watling’s Blue Hole and the Taam Ja’ Blue Hole to the depths of other blue holes