1. Which is the term for a long, deep depression on the ocean floor — trench or island?
2. Which is the term for a mass of snow, ice and other material sliding swiftly down a mountainside — avalanche or flood?
3. Which is the term for an area of a desert that has a source of water to support vegetation — lagoon or oasis?
4. Which metal is a main component of the super-heated core inside Earth — iron or copper?
5. Which is the term for the location where a river enters a larger body of water, such as a lake or an ocean — channel or mouth?
6. Which is the term for the wearing away of the surface of the land — erosion or fossilization?
7. Which substance erupts from volcanoes or cracks in Earth’s surface — lava or loess?
8. Which is the term for the flowing movement of water in one direction in an ocean or river — current or typhoon?
9. Which is the term for a thin layer of ice crystals that forms on objects during a cold night — frost or dew?
10. Which landform is a tall, steep-sided tower of rock that eroded from a mesa — canyon or butte?
National Geographic Bee, National Geographic Society
ANSWERS: 1. trench 2. avalanche 3. oasis 4. iron 5. mouth 6. erosion 7. lava 8. current 9. frost 10. butte
