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Questions and Answers
What characterizes alluvial terraces?
What characterizes alluvial terraces?
- They are primarily created by glacial movements.
- They occur in mountainous regions only.
- They are step-like landforms formed by sediment deposition along rivers. (correct)
- They are formed by volcanic activity.
Why is the Doab region important for agriculture?
Why is the Doab region important for agriculture?
- It is characterized by dry terrain.
- It is enriched by fertile alluvial soil from two rivers. (correct)
- It is located far away from river sources.
- It has predominantly sandy soil.
What does the cross-section of a Doab typically reveal?
What does the cross-section of a Doab typically reveal?
- Gently sloping flat land between two rivers with elevated boundaries. (correct)
- Steep cliffs along the riverbanks and a dry central area.
- A completely level area with no significant features.
- Flat land with frequent rocky formations.
What natural feature is essential for preventing flooding in Doab regions?
What natural feature is essential for preventing flooding in Doab regions?
What typically defines the boundaries of a Doab?
What typically defines the boundaries of a Doab?
Flashcards
Alluvial Terraces
Alluvial Terraces
Step-like landforms created by rivers depositing sediment as their course changes. They stand above the surrounding area and are often found where rivers fluctuate in level or tectonic activity occurs.
Doab
Doab
A fertile land area located between the confluence of two rivers. It is enriched by the sediment deposition of both rivers, making it ideal for agriculture. It is typically gently sloping.
Doab Cross-section
Doab Cross-section
The Doab's cross-section reveals a gentle slope from the edges to the center. It is characterized by fertile alluvial soil, and the riverbanks form elevated boundaries. Smaller water channels help distribute water throughout the land, preventing flooding.
Doab: Fertile Land
Doab: Fertile Land
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Doab & Agriculture
Doab & Agriculture
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Study Notes
Alluvial Terraces
- Alluvial terraces are step-like landforms formed by sediment deposition along rivers
- They appear when rivers shift or lower their course,
- Leaving behind elevated, flat surfaces separated by steep slopes
- These surfaces represent former riverbeds, altered by tectonic activity or changing water levels
Importance of a Doab
- A Doab is a fertile land area between converging rivers
- Characterized by alluvial soil, deposition from both rivers
- Suitable for agriculture, typically due to the fertile soil and consistent water supply
- Notable examples in Pakistan include the Sind and Bist Doabs, crucial for crop cultivation
Cross-Section of a Doab
- Doab's cross-section shows a gently sloping flat land area situated between two rivers, with steep elevated banks on either side
- The central part typically consists of alluvial deposits, creating fertile soil
- Drainage features like small channels, streams, or irrigation canals distribute water across the land
- The land slopes towards the river channels, with occasional terraces at higher elevations along the riverbanks.
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