sentences: the collision of tectonic plates are found at the convergent boundaries & the collision of the boundaries causes rocks to fold ->  the collision of the tectonic plates causes rocks to fold at the convergent boundaries  the collision of the tectonic plates causes rocks to fold at the convergent boundaries & a mountain range is formed by rocks folding upon one another ->  mountains will form at the convergent boundaries by the collision of the tectonic plates  mountains will form at the convergent boundaries by the collision of the tectonic plates & the appalachian mountains are a kind of mountain -> the appalanchian mountains are formed at the convergent boundaries by the collision of the tectonice plates