An unconfined aquifer would form where its upper surface coincides with the water table.
The annual floods are very useful because they leave behind lots of sediments, material, debris...
When there's floodings, the water drags with it tons and tons of all sorts of sediments, material, debris, which after the water is retraced in it's river bed is left on the soil that has been flooded. So the soil gets lot of useful depositions which make her very fertile every year and extremely suitable for growing plants, this is the way in which alluvial soils are formed.
Answer:
Antarctica is the only continent with no permanent human habitation. There are, however, permanent human settlements, where scientists and support staff live for part of the year on a rotating basis. The continent of Antarctica makes up most of the Antarctic region.
Explanation:
The observation that Darwin made that suggested there had been geological changes in Earth's history were the giant tortoises. The correct option among all the options that are given in the question is the first option or option "A". Darwin was born on 12th of February in the year 1809 and died on 19th of April in the year 1882.