It is either the thermal effect, the greenhouse effect, global warming, or radiation balance.
Answer:
air pressure affects the weather pattern to a great extent. Rising air creates low pressure while sinking air creates high pressure.
Explanation:
Europe is not a typically dry place (unlike for exampe Mesopotamia) so it does not need rivers for irrigation.
Instead, rivers are needed more for transport - they have served as a means of communication and for the exchange of goods.
For example, Danube allowed a big-scale trade between the cities lying on it: Vienna, Budapest and Bratislava.
The successful hybridization of rice crops prevented famine in India in the 1960s.
Answer A.
