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.
In Germany, there was no peace and normality. The war guilt clause of the Treaty of Versailles failed to address the causes of conflict and to restore peace and normality, and in addition heightened the feeling of anger and injustice felt by the Germans, and gave them motivation for retribution.