1. During the Middle Ages, armies often attacked castles using large siege engines such as the counterweight trebuchet at left. What challenges might you face if you attacked a castle?

Some challenges that I could see would be the walls, possibly a moat, tar, and the towers.

Explanation: The wall is obliviously a main problem, trying to get over it or through it is a difficult challenge. The moat (if it has one) means that there is more than likely only one way to get in or out.  If it does have tar it means that the attackers are going to be put in a "sticky situation" And finally the towers, they have people at the top shooting arrows down at you, or throwing things at you.

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layers of the earth affect the waves and these effects are seen on instruiments such as seimometers