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The movement of two plates moving together and colliding with one another. The denser plate will subduct under the light plate, and if they are too light to subduct under, they converge and form a complex mountain range with great height.
This occurs when two continental plates are pushing against each other, and produces colossal bending and folding of the plate at the boundaries, which makes it likely to take shape of a fold mountain range. An example would be the Himalayas.
When an area of sea separates two plates, sediments will settle onto the sea floor and become sedimentary rocks. When the plates move towards each other, the layers of sedimentary rock become crumpled and folded, which makes them fold mountains.
syncline anticline Where the rocks are folded upwards, they are called anticlines. Where the rocks are folded downwards, they are called synclines.
Folds may be symmetrical or asymmetrical. In a symmetrical fold , the axial plane is vertical and the sides dip symmetrically from the axis. A symmetrical fold is one in which the axial plane is vertical.
Notes Axial Plane: an imaginary plane surface that divides a fold symmetrically Fold Axis: a line drawn along the points of maximum curvature of a layer of a fold Plunge: the angle between the horizontal plane and the fold axis