The biggest canyons in the world are under water. Beneath the Bering Sea off Alaska there are seven giant canyons: Bering Canyon, 240 miles long; Navarin Canyon, 60 miles wide; Zhemchung Canyon, 9000 feet deep. In comparison, the Grand Canyon in Arizona is only 10 miles wide, one mile deep and 250 miles long.
The Sahara, one of the world’s largest and driest deserts with sand up to thirty feet deep was once a land with flowing rivers, humid swamps and lush fields. Cave painting, 9,000 years old, found in the heart of the Sahara, show men herding cattle and hunting lions and hippos. About 2,000 years ago the cave painters, herders and animals left because the area that was rapidly becoming the desert we know today.
Seeds from a wild flower, the Artic Lupine, found in Alaska, have grown in the lab after being frozen in the ground for 10,000 years.