This is to represent a period of time in which nothing relative happened and would otherwise take up space on the timeline .
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Jagged means erose and pointed.
Jagged mountains peaks become more rounded by the process of weathering. This occurs as wind and rain slowly eat away at the mountain, removing tiny bits of the rocks at a time until the mountains look more rounded than jagged.
A line segment is a line that has 2 endpoints and all the points in between
erosion by water
timber line: line marking the upper limit of tree growth in mountains or northern latitudes