What is the name of the 3.5-mile-long (5,600 m), 5.5 km wide semi-circular scalloped precipice in the Grand Coulee in Washington, USA?
Which of these is a natural area of roughly 16 square km (6.2 squ miles), which is 5 km (3.1 miles) west of Tuktoyaktuk, Canada, in a coastal region of the Arctic Ocean, which contains approximately 1,350 Arctic ice dome hills?
Which of these is a 600-mile (1,000 km) strip of land on the Pacific coast of South America, that is believed to be the driest desert in the world?
