Problem:OPTIONS:
- power
- friction
- black hole
- wind
- gravity
- orbit
- earth
- eclipse

Fact 1: Gravity causes objects that have mass to be pulled down on a planet. Fact 2: Astronomy is the scientific study of the stars, planets and the other celestial bodies. Given the two facts above, what causes objects to be pulled down on a celestial body?
****
A: gravity

Fact 1: Heating a liquid can be used to identify that liquid 's boiling point. Fact 2: Fire has intense heat. Given the two facts above, what can be used to identify a liquid's boiling point?
OPTIONS:
- Acids
- warmth
- sodium
- Urea
- sugar
- SO2
- fire
- energy
fire

Fact 1: Faulting of rock in Earth 's crust causes earthquakes. Fact 2: Earthquakes and volcanoes are violent proof of Earth's shifting crust. Given the two facts above, shifting in the Earth's crust are caused by what?
OPTIONS:
- Greenhouse gases
- rock beds
- friction
- avalanches
- fault in rocks
- no movement in the crust
- Movement
- Time and energy

Answer: fault in rocks

Question: Fact 1: When water freezes , that water expands. Fact 2: Water density is determined by temperature. Given the two facts above, what property of a substance changes when it is frozen?
OPTIONS:
- motility
- molecular make-up
- molecules
- elements contained
- Weight
- energy
- size
- density
Answer: density

input with options: Fact 1: Cycles of freezing and thawing water cause ice wedging. Fact 2: Under the pressure of the innumerable wedges of ice, the rock cracks. Given the two facts above, what is created from cycles of freezing and thawing water?
OPTIONS:
- Something that is on the Moon
- swamp vegetation
- Something that cracks rocks
- sedimentary rocks
- A transportation fuel
- fissures of hot, acidic water
- Something inside the earth
- Something that flies
output: Something that cracks rocks

Problem: OPTIONS:
- Pesticides
- wind
- heat energy
- acid rain
- friction
- Pollution
- coal
- oil
Q: Fact 1: Gases from burning coal and oil dissolving in water in the atmosphere causes acid rain. Fact 2: Coal-fired power plants contribute to acid rain. Given the two facts above, what can power plants cause?
Answer:
acid rain