Problem:OPTIONS:
- down
- scuba diving
- soils
- pastureland
- canyon
- driving
- Mountains
- mines

Fact 1: Most canyons are formed by flowing rivers through erosion over long periods of time. Fact 2: Striations in rock forms are seen along the river and tell the geologic history of the area. Given the two facts above, where can one readily see the geologic history of an area?
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A: canyon

Problem:OPTIONS:
- Air
- ocean
- water
- bears
- oxygen
- sun
- breathe
- food

Fact 1: Most people can survive only a few days without water. Fact 2: Man's survival depends on water. Given the two facts above, what do men need to live?
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A: water

Problem:OPTIONS:
- eyes
- a nervous system
- kinetic energy
- Chlorophyll
- Energy.
- life
- a backbone
- Energy

Fact 1: Invertebrates are animals that lack a vertebral column, or backbone. Fact 2: Snails and slugs are invertebrates. Given the two facts above, what do snails and slugs lack?
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A: a backbone

Problem:OPTIONS:
- Rain.
- Wind
- Forestry Services.
- erosion
- vehicles
- Conifer logging.
- Logging.
- Pollution

Fact 1: Creating wood-free paper does not require cutting down trees. Fact 2: Rainforests are destroyed by logging and all of the trees are cut down. Given the two facts above, what destroys rainforests?
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A:
Logging.