What percentage of Earth's surface is covered by oceans?

About 71% About 30% About 50% About 90%

How many major oceans does Earth have?

Five Three Four Six

Which is the largest ocean on Earth?

Pacific Ocean Atlantic Ocean Indian Ocean Southern Ocean

Which is the smallest ocean?

Arctic Ocean Southern Ocean Indian Ocean Atlantic Ocean

How did Earth's oceans most likely form?

Water arrived primarily from volcanic activity releasing steam and from icy comets and asteroids Rivers gradually filled large basins over millions of years The moon's gravity pulled underground water to the surface Oceans have always existed exactly as they are since Earth formed

Approximately how old are Earth's oceans?

About 3.8 billion years old About 100 million years old About 500 million years old About 10 billion years old

How do oceans help regulate Earth's climate?

By absorbing large amounts of heat and carbon dioxide from the atmosphere By reflecting most sunlight away from Earth By generating oxygen through underwater volcanic activity By cooling the atmosphere exclusively through evaporation

Which ocean borders Europe, Africa, and the Americas?

Atlantic Ocean Pacific Ocean Indian Ocean Southern Ocean

Which of the following is NOT a way oceans support human civilization?

They directly supply all of Earth's freshwater for drinking Providing food through fishing Enabling global trade via shipping routes Influencing rainfall patterns that support agriculture

Which ocean surrounds Antarctica?

Southern Ocean Arctic Ocean Pacific Ocean Indian Ocean