1) You're sitting in a boat filled with iron, in a pool. What happens with the waterlevel in the pool when you throw out the iron in the pool. Why? Really I don't get this. Either the level is constant, nothing changes, or the level rises? I had a discussion with some classmates and no one could figure it out! Help please? 2) Place icecubes in a glass and fill the glass with water to the brim. The ice will stick upp somewhat out of the glass. What happens to the waterlevel when the ice melts. why? I don't get this either :O First I thought that the water level would decrease because ice has lower density, now I'm not so sure anymore.