In short, I believe Darwin's theory was controversial in the 1800s because it contradicted the biblical view of creation.
(Sorry for the shortness.)
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They were killed and convicted of being supporters of capitalism.
This collectivization led to famine killing millions of people. Others who refused to coorperate were banished to siberia. About 15 million were banished and 3 million most of the children died on the way. :(
I hope this helps by
All the material has to be direct bearing or can be an assistance in the constructing the history of a particular period are called as historical facts or sources <span />
Because there will always be water on earth, meaning that the cycle will never stop. And because the cycle is continuous and natural. I don't think anything can stop it from happening.