Cliffs can collapse because of the weather naturally eroding it. Also when water is constantly crashing against them, it can erode the layers of the cliff. It can also happen in a mud slide when the rain makes the soil extremely wet causing the rock to fall. Also in a rock slide when a piece of rock breaks off from the entire cliff.
Hello. You did not show the cartoon to which the question refers, which makes it impossible for it to be answered accurately, but I will help you in the best possible way.
When an artist does a political cartoon, he is trying to make the public realize an adverse situation that is happening in politics in a critical and punctual way. Political cartoons generally present political issues in a satirical and ironic way, but they can also expose these issues in a literal and serious way.