CAN YOU HELP ME PLEASE UNRGENTLY NEEDED.THANKS FOR HELPING ME TO GET SOME ANSWERS FOR THIS QUESTION BELOW.
1. SOME VALLEYS WERE NOT ERODED BY THE RIVERS FLOWING IN THEM.VALLEYS CAN BE FORMED BY FAULTING AND GLACIAL EROSION.
WHAT FEATURES COULD YOU LOOK FOR WITH IN VALLEYS TO TELL IF THEY WERE FORMED BY FALTING? BY GLACIAL EROSION?
It's difficult to read post in all caps.
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Of course, I'd be happy to help you with your question!
To determine if a valley was formed by faulting or glacial erosion, there are specific features you can look for:
1. Faulting-formed Valleys:
- Fault Scarps: Look for steep, vertical cliffs or scarps along the sides of the valley. These are caused by the displacement of rock layers along a fault line.
- Horsts and Grabens: Observe if the valley floor has alternating blocks of uplifted (horsts) and down-dropped (grabens) sections. This indicates faulting activity.
2. Glacial-formed Valleys:
- U-shaped Cross-section: Glacial valleys typically have a distinct U-shaped cross-section, wider and flatter at the bottom and with steep sides. This shape is a result of the grinding and scouring action of glaciers.
- Striations and Polish: Examine the rock surfaces within the valley. Scratches or striations parallel to the direction of ice movement and smooth, polished bedrock are signs of glacial abrasion.
- Moraines and Erratics: Look for moraines, which are deposits of rock and sediment left behind by a glacier. Large boulders (erratics) that are different from the surrounding rock may also be present.
By analyzing these features, you can determine whether a valley was formed primarily by faulting or glacial erosion. Remember to consider context and observe multiple indicators to reach a more accurate conclusion.