Natural Environment

3. A hollow place in the ground, typically with an opening to the surface.
4. A meteorological phenomenon that is caused by reflection, refraction, and dispersion of light in water droplets, resulting in a spectrum of colors.
6. A steep fall of water in a river or stream.
8. The time in the morning when the sun rises above the horizon.
11. A sandy or pebbly area of land next to the sea or another body of water.
12. A vast expanse of saltwater that covers most of the Earth's surface.
13. A piece of land surrounded by water.
14. A barren area of land where little precipitation occurs.

1. A large, flowing body of water that moves toward a lake, ocean, or sea.
2. The reproductive structure found in flowering plants, usually with vibrant petals.
5. A flying insect with colorful wings and a slender body.
7. A large body of water surrounded by land.
8. The time in the evening when the sun disappears below the horizon.
9. A tall natural elevation of the earth's surface with steep sides.
10. A large area covered with trees, plants, and wildlife.