Covalent compounds can be subdivided into polar and no polar compounds. In water, a polar molecule, the hydrogen electrons are not shared equally with the oxygen atoms; this results in a polar bond. Oxygen due to it's greater electro negativity pulls the electrons closer to its nucleus.
The Treaty of Versailles was the main causes of World War II due to the following reasons,Germany had to pay back 33 billion after WWI and forced to accept sole blame for the war in order to justify the reparations.
If Germany really had caused the war and was responsible for all damages, the Treaty would then be fair, but it wasn't them that had caused all these disturbances. One of the main causes of the war was the assassination of Archduke Franz Ferdinand by Gavrilo Princip, a Serbian terrorist.