The topography of Bangladesh is frequently altered due to floods.
<u>Explanation</u>:
Even though Bangladesh is a small country, it has considerable topographic diversity.
It has three prominent features - a large alluvial plain subject to frequent flooding, a slightly elevated relatively older plain and a small hill region drained by flashy rivers.
Bangladesh experiences heavy monsoon rains, especially over the highlands.
Causes of flooding in Bangladesh include -
i. monsoon climate which brings heavy rains.
ii. spring snow-melt which results in soil erosion and a rapid increase in river discharge.
ii. deforestation in head water areas due to increasing population in Nepal and Tibet.
iv. rivers slit-up due to increased soil erosion which raises river beds and lowers the capacity of the channel resulting in floods.
Explanation: refers to proportion of area under different crops at different points of time. It also indicates the time and spatial arrangement or sequence of crops and / or fallow in a particular land area.
I believe that the discovery of new artifacts can bring many improvements to historical interpretations along with additional information for understanding historical facts. Thus, new causes can be found and analyzed that could lead to a certain phenomenon.
