Question

D. Long Answer Type Questions.

1. Distinguish between degradation and aggradation.

2. How is erosion different from weathering?

3. How is a waterfall formed?

4 Explain the formation of a sand dune.

5. Describe the landforms formed by a river in the plains​

Answer 1

Explanation:

1) aggradation is an increase in elevation of land as usually in river system due to deposition and sediments degradation happens because of erosional activities of mainly wind and water

2) while weathering and erosion are similar process they are not synonymous weathering involves the breakdown of rocks and minerals on earth whereas erosion involves the removal of soil and rock materials

3) waterfalls are made when a layer or harder rocks overlays on a layer of softer rocks as the river passes over the softer rocks it erods faster forming a step hydrolic action erodes and makes the plunge pools and notch bigger

4) a dune is a mound of sand formed by the wind usually along the beach or in a desert dunes form when wind blows sand into a sheltered area behind an obstacle dunes grows as grains of sand accumulate every dune has a windward side and a slipface

5) flood plains , levees , distributries and deltas are the various landforms formed by a river in a plain flood plain is a flat land adjacent of a river that expiriences flooding periodically after the flood the river leaves behind a fresh layer of top soil which is very fertile