Fact 1: Being exposed to wind can cause erosion of soil. Fact 2: Soil erosion causes crop yields to decrease. Given the two facts above, what is a possible negative effect of exposing soil to wind ?
OPTIONS:
- It used to be covered by water
- exposure to cold
- decrease in crop yields
- greater food production
- elimination of harmful pests
- a tree falling
- wind power increases
- Damages them

Answer: decrease in crop yields

Fact 1: Skin is used for breathing air by frogs. Fact 2: Every frog starts as a tadpole. Given the two facts above, what do tadpoles use to breathe?
OPTIONS:
- Water
- Gases
- oxygen
- hearts
- air
- fur
- skin
- lungs

Answer: skin

Fact 1: Natural disasters can cause animals to leave an environment. Fact 2: Goats are herd animals. Given the two facts above, what can be caused to leave an environment by natural disasters?
OPTIONS:
- pigeons
- leeches
- humans
- earthquake
- tornado
- plants
- goats
- death

Answer:
goats