Problem:OPTIONS:
- uranium
- oxygen
- cartilage
- nothing
- an object
- vacuum
- energy
- heat

Fact 1: Chemical weathering causes iron in rock to oxidize. Fact 2: Oxides Oxides Oxides are elements combined with oxygen. Given the two facts above, chemical weathering causes iron in rock to combine with what?
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A: oxygen

Problem:OPTIONS:
- a prism
- stasis
- programmed
- inertia
- A computer
- mechanical
- origami
- stabilization

Fact 1: Folding an object causes that object to change shape. Fact 2: Origami figures are paper folding art projects. Given the two facts above, what is a method for changing an object's shape?
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A: origami

Problem:OPTIONS:
- steak
- Eye patch
- electricity
- energy barrier
- photons
- energy
- our nearest star
- Wishful thinking

Fact 1: Alight bulb is used for seeing in the dark. Fact 2: Electricity can be converted in to light using light bulbs, and even heat by using heating coils. Given the two facts above, what is used to see in the dark?
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A: electricity

Problem:OPTIONS:
- rainfall
- wind
- rest
- spring
- autumn
- pollution
- taxes
- death

Fact 1: Earth 's tilt on its rotating axis causes seasons to change. Fact 2: Autumn brings the changing of the seasons. Given the two facts above, earth's tilt on its rotating axis causes what?
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A:
autumn