Natural Topography Past Paper PDF - November 2024
Document Details
Uploaded by AffectionateVerse8939
International School Lahore
2024
Raahil Shahzad
Tags
Summary
This is a past paper containing questions and answers on natural topography, focusing on alluvial terraces and doabs. It details their formations, characteristics, and importance, particularly in the context of agriculture.
Full Transcript
# November 2024 - Natural Topography ## Q/A ### Q1) What are Alluvial Terraces? **Ans** Alluvial terraces are step-like landforms formed by sediment deposition along rivers. They occur when a river shifts or lowers its course, leaving behind elevated, flat surfaces. These terraces are separated b...
# November 2024 - Natural Topography ## Q/A ### Q1) What are Alluvial Terraces? **Ans** Alluvial terraces are step-like landforms formed by sediment deposition along rivers. They occur when a river shifts or lowers its course, leaving behind elevated, flat surfaces. These terraces are separated by steep slopes and represent former flood plains or river beds, often seen in regions with changing water levels or tectonic activity. ### Q2) What is the importance of a Doab? **Ans** A Doab is a fertile land area situated between two converging rivers, often characterized by its fertile alluvial soil. This region is typically enriched by sediment deposition from both rivers, making it highly suitable for agriculture. Topographically, a Doab usually has a gentle sloping terrain, with the rivers defining its boundaries and providing water for irrigation. In Pakistan, notable examples include the Sindh and Bist Doabs. These areas are vital, particularly for growing crops like cotton, wheat, and rice due to the abundant water supply and fertile soil. ### Q3) Describe the cross-section of a Doab. **Ans** The cross-section of a Doab reveals a gently sloping flat land area situated between 2 rivers, with the riverbanks on either side forming steep, elevated boundaries. The center of the Doab is typically characterized by alluvial deposits that create fertile soil ideal for agriculture. Drainage features include small channels, spreads, or irrigation canals that distribute water from the rivers across the land. These features ensure enough water is supplied to prevent flooding. The land gradually slopes towards the river channels, which may have low-lying flood plains or a generally level topography. There are occasional terraces forming at higher elevations near the river.