Huge Lava Lamp

Hi, Alba writing. This is a very special worksheet. Guess why. IT ISN´T ONE. This huge worksheet is result of joining four of them: starting from top to bottom is the worksheet by Marcos, then is mine, the next one is from a guest (whose name starts with M) and the one in the bottom is Marina´s. We could decide what to do so we deciced to do... A LAVA LAMP (just in case you didn´t notice it was a lava lamp)