Fact 1: Soil is formed by rocks eroding. Fact 2: Rivers erode the rocks they flow over. Given the two facts above, what do rivers do to rocks?
OPTIONS:
- storing water
- to move people
- they bend
- Make them get bigger
- It has no effect on rocks
- Polish them
- Turn it to soil
- protect them

Answer: Turn it to soil

Fact 1: Planting trees has a positive impact on an ecosystem. Fact 2: Knowledge of woodland ecosystems is advantageous. Given the two facts above, woodlands benefit from what?
OPTIONS:
- planting trees
- nutrients
- deforestation
- lowered energy cost
- food and shelter
- rainforest
- genetic diversity
- urban sprawl

Answer: planting trees

Fact 1: Earthworms are important deposit feeders that help form and enrich soil. Fact 2: Earthworms by Casey Earthworms are invertebrates. Given the two facts above, invertebrates can be what?
OPTIONS:
- people
- scarce resources
- vertebrates
- deposit feeders
- Catch prey
- major threat to health
- more abundant
- planets

Answer:
deposit feeders