Earth Science Folding – The process by which crustal forces deform an area of crust so that layers of rock are pushed into folds. Faulting – The process by which crustal forces cause a rock formation to break and slip along a fault. Fold – A bent or warped stratum or sequence of strata that was originally horizontal, or neatly so. Fault – A planar or gently curved fracture in the earth’s crust across which there has been …showed first 75 words of 672 total…

…showed last 75 words of 672 total…below, causing a shortening of the section. § Thrust fault – a reverse fault at which the dip of the fault is small, so that the overlaying block is pushed mainly horizontally. § Rift Valley – A depression where one block looks as though it had dropped between two flanking blocks that have been pulled apart. § The fault must be younger than the youngest rock it cuts and older than the oldest undisrupted formation that covers it. ------------------------------------------------------------------------ **Bibliography**