Nature

2. natural underground hollow or passage, typically formed by the erosion of rock.
5. large area of land covered with trees, plants, and wildlife.
6. large body of water surrounded by land, usually freshwater and often fed by rivers or streams.
7. rapidly rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud, often characterized by a funnel-shaped cloud extending downward.
8. luminous celestial body consisting of a mass of hot gas that emits light and heat.
13. piece of land that is surrounded by water, smaller than a continent.
14. deep, narrow valley with steep sides, often carved by a river.
15. sandy or pebbly area along the shore of a body of water, such as an ocean, sea, or lake.
16. moment when the sun appears above the horizon in the morning, marking the beginning of a new day.

1. cascade of water that falls from a height, often flowing over rocks or cliffs.
3. dry, barren region that receives very little rainfall and is characterized by sand dunes, cacti, and extreme temperatures.
4. large natural elevation of the earth's surface that rises steeply above the surrounding land.
9. natural phenomenon that appears in the sky as a circular arc of colors, caused by the reflection, refraction, and dispersion of light in water droplets.
10. mountain or hill with a crater or vent through which lava, rock fragments, hot gases, and ash are ejected from the earth's crust.
11. large mass of ice that moves slowly down a mountain or over land.
12. flowing body of water that is typically large and permanent, flowing towards an ocean, sea, lake, or another river.