How many time zone are there on earth

What is a compass? how does it work

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j