๐ Topic Summary
Glaciers, massive bodies of ice, are powerful agents of erosion and deposition. As they move, they carve out valleys, transport sediments, and create distinctive landforms. Understanding glacial processes and landforms is crucial for interpreting past climates and landscapes. From U-shaped valleys to moraines, glaciers leave an indelible mark on the Earth's surface.
๐ง Part A: Vocabulary
Match the following terms with their definitions:
| Term |
Definition |
| 1. Moraine |
A. A bowl-shaped depression formed by glacial erosion. |
| 2. Cirque |
B. A ridge of unsorted sediment deposited by a glacier. |
| 3. Esker |
C. A long, winding ridge of sediment deposited by a meltwater stream flowing beneath a glacier. |
| 4. Kettle Lake |
D. A lake formed when a block of ice left behind by a glacier melts. |
| 5. U-shaped Valley |
E. A valley with steep, straight sides and a flat bottom, carved by a glacier. |
(Answers: 1-B, 2-A, 3-C, 4-D, 5-E)
๐ง Part B: Fill in the Blanks
Glacial erosion occurs through two main processes: plucking and __________. Plucking involves the freezing of water around rocks and the subsequent removal of those rocks as the glacier moves. __________ is the grinding action of the glacier against the underlying bedrock. The sediment transported by glaciers, known as __________, is typically unsorted and angular. When a glacier retreats, it leaves behind features like __________ and drumlins.
(Answers: abrasion, Abrasion, till, moraines)
๐ค Part C: Critical Thinking
How might the study of glacial landforms help us understand past climate change, and what are the implications for predicting future climate scenarios?