Q: Fact 1: Coal is used to produce electricity by burning in coal-fire power stations. Fact 2: Coal-fired power stations can cause acid rain and contribute to global warming. Given the two facts above, certain types of electricity production can cause acid rain and contribute to:? | OPTIONS:
- global cooling
- global warming
- energy usage
- coal mining
- deforestation
- electrical
- Destroy bridges
- salinity
A: global warming

Q: Fact 1: Muscle contraction occurs when muscle fibers get shorter. Fact 2: Muscles in the upper arm called biceps are used to flex the arm. Given the two facts above, what gets contracted when fibers get shorter? | OPTIONS:
- nerves
- h2o
- veins
- firm hugs
- fur
- biceps
- the skin
- density
A: biceps

Q: Fact 1: Food consists of organic molecules that store energy in their chemical bonds. Fact 2: All organic matter eventually decomposes. Given the two facts above, what eventually decomposes? | OPTIONS:
- Carbon
- food
- bushes
- fungus
- Fungi
- time
- metal
- space
A: food

Q: Fact 1: Sedimentary rocks are formed by deposition. Fact 2: Limestone is a type of sedimentary rock. Given the two facts above, how is limestone formed? | OPTIONS:
- In sediment
- Deposition.
- Metamorphic processes.
- Igneous processes.
- Magma processes.
- less water
- Water expanding
- It expands
A: Deposition.