These will be hand marked to decide who wins the cash prizes and scholarships. Don't expect to be able to answer all the questions. If you finish half, you are doing well. There are penalties for wrong answers. Random guessers should expect 0, or even a negative result.
All questions are of equal value, but some are tougher than others.
Some questions contain more data than you need to solve the problem. Eratosthenes knew that the small town called Syene was about 5000 stadia due south of Alexandria. Eratosthenes had heard that the Sun shone directly down a deep well at noon on the longest day of the year. 800 cm Solution 2. It is feared that this additional CO 2 will trap more of the infrared light emitted by the earth, resulting in an overall trend of global warming.