Problem:OPTIONS:
- clouds
- soils
- cavern
- electricity
- mountain
- rain
- rivers
- flooding

Fact 1: Sinkholes are formed by precipitation. Fact 2: Eventually, the sinkhole collapses into cavern. Given the two facts above, precipitation filling an underground void can create what?
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A: cavern

Problem:OPTIONS:
- Pulleys
- a prism
- Machines
- Heat energy
- Animals
- mechanical
- Lifts
- Temperature

Fact 1: Folding an object causes that object to change shape. Fact 2: Tri-folds and half folds are acceptable if machine folded. Given the two facts above, what can cause objects to change shape?
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A: Machines

Problem:OPTIONS:
- kinetic energy
- coal
- eating dinner
- hydration
- heat energy
- growing vegetables
- electricity
- Energy

Fact 1: Arefrigerator is used for keeping food fresh for a long period of time. Fact 2: Refrigerators are major users of electricity. Given the two facts above, keeping food fresh is a major user of what?
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A: electricity

Problem:OPTIONS:
- kill them
- decrease stamina
- protect them
- massive damage
- toxins
- animals
- hydrate them
- burn them

Fact 1: Apesticide is used for protecting plants by killing insects. Fact 2: Excessive reliance on pesticides can kill friendly insects and predators. Given the two facts above, pesticides do what to plants by killing predators?
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A:
protect them