Two friends were in college. Hank studied plate tectonics, while his buddy Alex studied Earth's atmosphere. They were both very fascinated by the subjects. Which student learned more about mantle convection?
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Answer: Hank

Recently a large amount of factories have been built in Illinois using fossil fuels as their main energy source. In Indiana however, many of their factories have been shut down and replaced by parks with many plants and trees. Given Illinois adds even more of these fossil fuel burning factories will the levels of carbon dioxide increase or decrease?
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Answer: increase

Ted had 2 uncles. Uncle Jerry was getting up there in age, he was 78 years-old. Uncle Tom was younger, he was in his early 50's and still very active and productive. Which uncle didn't free up his time for hobbies?
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Answer:
Tom