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3 questions please science masters, please help me understand them?!?

thanks a lot. 1) Would carbon-14 dating be an effective tool to determine whether a dinosaur bone is from the mesozoic Era? Explain. 2) You are going to dig a well. You hvae the choice of digging it into sandtone or into shale. Which type of rock would probably be a better source of water? Explain your answer. 3) Why do roads in northern states such as Maine or Michigan need to be repaired more often than roads in southern states such as Florida or Louisiana? Thank u all so much!

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1. 1) Look up the half-life of carbon 14, and how long ag othe mesozoic era was. This will require at least a passing knowledge of how radioactivity is used to estimate dates. 2) Dunno. 3) Look up 'frost heaves'.