Geography

6. Reefs Underwater structures made up of tiny organisms called coral polyps, providing habitats for a variety of marine life.
7. Low-lying areas between mountains or hills, often with a river flowing through them and fertile soil for farming.
11. Large bodies of water surrounded by land, often freshwater and home to various fish and other aquatic creatures.
12. Areas where land is covered by water, either permanently or seasonally, providing habitat for many different species.
13. Pieces of land surrounded by water, often smaller than continents and home to unique plant and animal species.
14. Huge masses of ice that move slowly over time, shaping the landscape and leaving behind lakes and valleys.
16. Deep, narrow valleys with steep sides, often formed by the erosion of rivers over millions of years.

1. Vast bodies of saltwater that cover a large part of the Earth's surface. They are home to many different types of marine life.
2. Hollow spaces underground, formed by the movement of water, and often containing interesting rock formations.
3. Mountains with openings that can release hot lava, ash, and gases from deep inside the Earth.
4. Large areas of land with very little rainfall, characterized by hot days, cool nights, and sandy or rocky terrain.
5. Flat or gently sloping elevated landforms, often surrounded by cliffs or steep slopes on one or more sides.
8. Cold, treeless areas with frozen ground found in the northernmost parts of the world, where hardy plants and animals survive.
9. High, towering landforms with peaks, slopes, and often covered in snow.
10. Areas with many trees and plants, providing homes for animals and helping to clean the air we breathe.
15. Long, flowing bodies of water that often start from mountains and flow into oceans or other rivers.