Answer:
1. Mount Everest, located in Nepal and Tibet, is usually said to be the highest mountain on Earth. Reaching 29,029 feet at its summit, Everest is indeed the highest point above global mean sea level—the average level for the ocean surface from which elevations are measured
2. Something completely different. That desire led us to Mount Wycheproof, the world's smallest registered mountain. Located in Australia's Terrick Terrick Range, Mount Wycheproof stands 486 ft (148 meters to the rest of the world) above sea level, which is not bad as far as small mountains go.
3. Mount Apo, active volcano, south central Mindanao, 20 miles (32 km) west of Davao City; it is the highest point in the Philippines, rising to 9,692 feet (2,954 metres).
4. The mid-ocean ridge is the longest mountain range on Earth. Spanning 40,389 miles around the globe, it's truly a global landmark. About 90 percent of the mid-ocean ridge system is under the ocean. This system of mountains and valleys criss-crosses the globe, resembling the stitches in a baseball.
