Buckle folds form by squashing layers along their length, as shown above. Which way do you think the folds will form? Click the button to see if you're right. If you continue after that you'll find out how to describe folds properly, in terms of the orientations of their hinge line and axial surface. You'll also see more of the different fold geometries that result - and how to describe them. Or click here to return to the descriptions menu.