Earth

4. A vast body of saltwater that covers a significant portion of the Earth's surface, such as the Pacific, Atlantic, or Indian Ocean.
7. A large mass of ice that moves slowly over land, shaping the landscape over thousands of years, like the Greenland Ice Sheet.
8. A vast, treeless Arctic region with low temperatures, frozen subsoil, and short growing seasons, like the Siberian Tundra.
11. A high and steep natural elevation on the Earth's surface, often with rocky peaks, like the Himalayas or the Rocky Mountains.
12. A piece of land that is almost completely surrounded by water but connected to the mainland, like the Iberian Peninsula.
14. A landmass smaller than a continent and surrounded by water, like Hawaii or the Maldives.
15. A large underground chamber or cave, often formed by the dissolution of limestone or other soluble rocks.

1. A deep, narrow valley with steep sides, often carved by a river, like the Grand Canyon in the United States.
2. A barren and dry landscape with little or no vegetation, such as the Sahara Desert or the Gobi Desert.
3. The gradual wearing away or weathering of the Earth's surface by wind, water, or other natural processes.
5. One of the seven large landmasses on Earth, such as Africa, Asia, Europe, North America, South America, Australia, or Antarctica.
6. A large area covered with many trees and various plants, often home to diverse wildlife, like the Amazon Rainforest or Boreal Forest.
9. A flat or gently sloping elevated area with steep sides, often found between mountains, like the Colorado Plateau.
10. A mountain or hill with a crater or vent through which lava, rock fragments, and gases erupt from the Earth's interior.
13. A natural flowing watercourse that typically leads to a lake, sea, or ocean, like the Nile, Amazon, or Mississippi River.