Worldwide, the oldest rocks at the ocean floor are about 180 million years old. In contrast, the oldest continental rocks are approximately 4 billion years old. Give a possible explanation for this large age difference. Hint: Consider which type of lithosphere, oceanic or continental, is denser and therefore more prone to subduction (and destruction) before reaching old age.

Nuclear experimentation is a major global issue that affects relationships between countries. describe why countries try to limit the testing of nuclear weapons.

The european union was formally established in

What is the difference between the cultures of central asia and the caucasus region? the majority of people in central asia are muslim; the majority in the caucasus region are christian. the primary language in central asia is armenian; the primary language in the caucasus region is russian. central asia has been plagued by ethnic unrest; the caucasus region has had little ethnic conflict. the effects of soviet rule can still be seen in central asia; the caucasus region has developed its own identity since the fall of the ussr.