I guess formal and informal refer to two types of essay - you can write a formal essay where you avoid conversational language and such and where you need to be very professional, or you can write informally where you don't have to think about such things, it is very casual.
Answer: Hello, Hikers get caught in a snow storm or a thunder strom or a tronado strom and must find shelter
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What class is this for? When is it due?
