Question 1: What percentage of the Earth's surface is covered by oceans?
Question 2: Which ocean is the largest and deepest in the world?
Question 3: What is the name of the phenomenon by which ocean water circulates around the globe, driven by differences in temperature and salinity?
Question 4: Which marine mammal, known for its distinctive black and white coloring and playful behavior, is the largest member of the dolphin family?
Question 5: What is the name of the international treaty, first signed in 1959, that sets aside Antarctica and its surrounding waters as a scientific preserve and bans military activity on the continent?

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