Problem:OPTIONS:
- heat
- dry air
- blue skies
- rain
- storms
- drought
- Injury
- force

Fact 1: Awarm front causes cloudy and rainy weather. Fact 2: If warm air is advancing on cold air, the front is designated a warm front. Given the two facts above, what is a result when warm air advances on cold air?
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A: rain

Problem:OPTIONS:
- under ground
- in the open
- food and shelter
- threatened
- above ground
- important habitats
- survive
- in the fields

Fact 1: If an animal lives under ground then that animal will be protected from a wild fire. Fact 2: Wild fires rage in California. Given the two facts above, animals that live where in California will be protected from some natural disasters?
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A: under ground

Problem:OPTIONS:
- waves
- sunlight
- Mass
- moon
- weight
- force
- wind
- asteroid

Fact 1: The gravitational pull of the Moon on Earth 's oceans causes the tides. Fact 2: For example, ocean tides are caused by the sun and moon's gravity pulling on the water. Given the two facts above, what causes tides?
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A: moon

Problem:OPTIONS:
- Light
- Energy.
- fire
- waves
- heat
- energy
- gas
- LEDs

Fact 1: Afirecracker converts chemical energy into sound. Fact 2: Particularly interesting waves are sound waves . Given the two facts above, what does a firecracker convert chemical energy into?
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A:
waves