There is a great deal of folding that takes place in the crust of the earth apart from the mountain building that goes on near subducting trenches. A geologic map of any region will show synclines, anticlines, isoclinal folds, etc. The folds come about as sediments, laid down on a level or semi-level plane harden sufficiently to form a cohesive layer, and are then subjected to large-scale intercontinental stress or strain (pushing and shoving of the earth's crust from the forces of plate tectonics). The crust deforms and cracks, folding into hills and valleys which are then eroded, starting the whole process all over again.
Go to a listing of Rocks by mineral group
There is a great deal of folding that takes place in the crust of the earth apart from the mountain building that goes on near subducting trenches. A geologic map of any region will show synclines, anticlines, isoclinal folds, etc. This folding is just the same as when a person presses hard against a lump of clay.
The folds come about as sediments, laid down on a plane harden sufficiently to form a cohesive layer, and are then subjected to pushing and shoving of the earth's crust from the forces of plate tectonics. The crust deforms and cracks, folding into hills and valleys which are then eroded, starting the whole process all over again.
Go to a listing of Rocks by mineral group
There is a great deal of folding that takes place in the crust of the earth apart from the mountain building that goes on near subducting trenches. This folding is just the same as when a person presses hard against a lump of clay.
When sediments form a cohesive layer, they are then subjected to pushing and shoving of the earth's crust from the forces of plate tectonics. The crust deforms and cracks, folding into hills and valleys which are then eroded, starting the whole process all over again.
Go to a listing of Rocks by mineral group
