GLY-1103 Lecture Notes - Lecture 10: Porthole, Deglaciation, Landform
Document Summary
If accumulation = ablation the toe stays the same. Majorly change landscapes, strips the ground to bedrock. Glacier outwash plains- braided rivers dominate due to high sediment levels. Glacier paths through history can be tracked by striations, u-shaped valleys, hanging valleys, cirques, aretes (ridgelines), horns, or truncated spurs. End moraines mark the maximum extent of a glaciation. During the last ice age, glaciers extended to pennsylvania. Kettle lakes- small, porthole lakes caused by glaciers calving large blocks of ice into sediment. Drumlins- teardrop shaped landforms caused when glaciers move over soft land. Eskers- snake shaped landform from when sediment choked a channel out. Sea level- ice ages cause sea level to rise and fall. Water is stored on land during ice age- sea level falls. Deglaciation returns water to the oceans- sea level rises.
