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Construct a diagram resembling the 6-20-B2 (attached ) figure, showing that a lowering of sea level need not always lead to regression.

Construct a diagram resembling the 6-20-B2 (attached ) figure, showing that a lowering of sea level need not always lead to regression.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Construct a diagram resembling the 6-20-B2 (attached ) figure, showing that a lowering of sea level need not always lead to regression. 

### Understanding Sea-Level Changes and Shoreline Shifts The image contains three diagrams labeled A, B, and C, illustrating how variations in sea levels impact the position of shorelines over time. #### Diagram A: Vertical Sea-Level Changes - **Time 1:** The shoreline is shown at a lower sea level, with a tree on the land and water on one side. - **Time 2:** An increase in sea level pushes the shoreline inland, resulting in the coastline moving closer to the tree. This represents a transgression, where sea level rises relative to the land. #### Diagram B: Tectonic Uplift - **Time 1:** The initial position of the sea and land is depicted, with a baseline shoreline. - **Time 2:** Land uplift has occurred due to tectonic activities, pushing the land higher and causing a regression despite no significant change in sea level. The shoreline moves outward, exposing more land. #### Diagram C: Sea-Level Fall and Topographic Changes - **Time 1:** The sea level is depicted at a certain height against the land. - **Time 2:** A decrease in sea level causes the shoreline to move outward, indicated by the dashed lines. The regression occurs as more land becomes exposed, illustrating how changes in actual sea level impact shorelines. ### Key Points - Vertical sea-level changes significantly influence the position of shorelines, causing transgressions and regressions. - Local geological activities, such as tectonic uplift, can also create shifts in shorelines without changes in sea level. - Understanding these processes helps in recognizing past and future changes in coastal environments. *Figure 6-20 emphasizes that a rise in sea level does not necessarily result in a transgression along all shorelines globally.*
Transcribed Image Text:### Understanding Sea-Level Changes and Shoreline Shifts The image contains three diagrams labeled A, B, and C, illustrating how variations in sea levels impact the position of shorelines over time. #### Diagram A: Vertical Sea-Level Changes - **Time 1:** The shoreline is shown at a lower sea level, with a tree on the land and water on one side. - **Time 2:** An increase in sea level pushes the shoreline inland, resulting in the coastline moving closer to the tree. This represents a transgression, where sea level rises relative to the land. #### Diagram B: Tectonic Uplift - **Time 1:** The initial position of the sea and land is depicted, with a baseline shoreline. - **Time 2:** Land uplift has occurred due to tectonic activities, pushing the land higher and causing a regression despite no significant change in sea level. The shoreline moves outward, exposing more land. #### Diagram C: Sea-Level Fall and Topographic Changes - **Time 1:** The sea level is depicted at a certain height against the land. - **Time 2:** A decrease in sea level causes the shoreline to move outward, indicated by the dashed lines. The regression occurs as more land becomes exposed, illustrating how changes in actual sea level impact shorelines. ### Key Points - Vertical sea-level changes significantly influence the position of shorelines, causing transgressions and regressions. - Local geological activities, such as tectonic uplift, can also create shifts in shorelines without changes in sea level. - Understanding these processes helps in recognizing past and future changes in coastal environments. *Figure 6-20 emphasizes that a rise in sea level does not necessarily result in a transgression along all shorelines globally.*
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