Explain the formation of Young Fold Mountains

Young Fold Mountains were formed around 35 million years ago but still form today. They are located in long, thin belts and are made of sedimentary rocks with granite and metamorphic rocks deep in the core. Exposure to the atmosphere and chemicals causes the weathering of rocks. Furthermore, the sea, rivers, ice and wind cause erosion. These sediments are transported into the sea. At a collision boundary (margin where 2 continental plates are drawn together by convection currents) a geosyncline builds up, this is a thick layer of sediment that starts to be compressed. The young fold mountains are then built because as the plates move closer together the sediments are folded and faulted, creating linear bands of uplifted rock.