Problem:OPTIONS:
- energy
- Pollution
- Evaporation
- moist soil
- Energy.
- flooding
- kinetic energy
- Heat energy

Fact 1: Water vapor condensing in clouds causes rain. Fact 2: When it rains, the rain moistens the soil. Given the two facts above, what does water vapor condensing in the clouds cause?
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A: moist soil

Problem:OPTIONS:
- Physical weathering
- moonlight
- sunshine
- flooding
- clouds
- precipitation
- scarce resources
- erosion

Fact 1: Sinkholes are formed by precipitation. Fact 2: Because of sinkholes, houses have disappeared. Given the two facts above, houses have disappeared because of what?
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A: precipitation

Problem:OPTIONS:
- Destroy soil
- Damages them
- Exfoliation
- Converting waste.
- competing for resources
- Compact soil
- Make soil denser
- Change the chemistry

Fact 1: Earthworm burrows help aerate soil, which is also good for plants. Fact 2: Aeration quickly changes the chemistry of the soil. Given the two facts above, what do earthworms do to soil?
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A: Change the chemistry

Problem:OPTIONS:
- dangerous
- illness
- fever
- Leptospirosis
- homogenous
- contamination
- negative
- nonliving

Fact 1: Viruses are usually considered to be nonliving. Fact 2: Some smallpox viruses are maintained in laboratories. Given the two facts above, what is smallpox considered to be?
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A:
nonliving