Lines 105 and 139: what are the two places where the plot shifts? what is the direction in which the plot shifts in each instance? (from the night face up by julio cortazan")

Mountains are usually formed at what are called convergent plate boundaries, meaning a boundary at which two plates are moving towards one another. ... Sometimes, the two tectonic plates press up against each other, causing the land to lift into mountainous forms as the plates continue to collide.