1. The water cycle is driven by which of the following?
A. sun
B. gas
C. rocks
D. soil
2. When water evaporates from a puddle on the street, where does it go?
A. into a river
B. it sinks into the street
C. it rises into the atmosphere
D. it goes into outer space
3. _____ is an important element in every living thing.
A. Lithium
B. Boron
C. Gold
D. Carbon
4. Ecosystems can be changed by natural events or by human actions. Which is NOT a natural event?
A. a forest fire started by lightning
B. pollution from a factory entering a river
C. a beaver building a dam in a river
D. an earthquake
5. What is the name of the process during which an ecosystem becomes a new and different ecosystem?
A. species
B. succession
C. community
D. pioneer
6. Every Tasmanian wolf on Earth has died. This means that the Tasmanian wolf species is _____.
A. threatened
B. endangered
C. extinct
D. hibernating
7. In which ecosystem are animals mostly active at night? (1 point)
A. desert
B. tundra
C. grassland
D. taiga
8. A _____ is a biome with a lot of rain, fog, and a cool climate. (1 point)
A. tropical rain forest
B. temperate rain forest
C. taiga
D. tundra
9. Plants that can live in water-soaked soil are able to survive in the _____________ ecosystem.
A. standing-water
B. running-water
C. wetland
D. saltwater
10. Which organism lives in a saltwater ecosystem? (1 point)
A. snail
B. whale
C. crawfish
D. water lily
11. The shallowest part of the ocean ecosystem is called _____. (1 point)
A. the abyssal zone
B. the beach
C. the bathyal zone
D. the intertidal zone
12. The formation of a new community where another community already exists is known as
A. primary succession.
B. secondary succession.
C. pioneer community.
D. pioneer species.
13. Which biome has no trees and is frozen year round? (1 point)
A. tundra
B. taiga
C. desert
D. grassland
14. Most pond organisms live in shallow water because (1 point)
A. the water is warmer.
B. the water is cleaner.
C. there is more oxygen.
D. there is less shelter.
15. _____ is a mixture of dead organic material that can be used as fertilizer.
16. A(n) _____ is one of Earth’s major land ecosystems with its own characteristic
animals, plants, soil, and climate.
17. The boundary where fresh water feeds into salt water is called a(n) _____.