I believe its the Rhine-Main-Danube Canal. Hope that helps!
The creation of approximately ten million refugees from 1947-48 was a result of World War II.
World War II brought destruction of lot of countries, millions of people lost their homes that were flattened with the ground, the economies were destroyed and on the verge of bankruptcy, so millions of people left their countries in search for better life (or rather just normal life).
There are a lot of volcanoes,mostly along the pacific ring of fire,mt Fuji in Japan,for example
https://www.reference.com/science/volcanoes-located-along-convergent-plate-boundaries-902a6027f2e299f1#
the link has got more example,you might want to check it out
hope it helps c:
A rational number can be in the form of a fraction, integer, whole number..
In this case, the square root of 36 is 6. For the other answer choices, you'll get an irrational number.
Therefore, the answer is square root of 36.