#15-Where Did the Oceans Come From

What is a comet made of?

• Rock and ice

• Gas and dust

• Metal and gas

• Water and dust

How do scientists believe comets contributed to the formation of oceans?

• By releasing water upon collision with Earth

• By creating large craters that filled with rainwater

• By changing Earth's orbit to bring it closer to water sources

• By causing volcanic eruptions that released water vapor

What happens to water vapor after it enters the atmosphere from the ocean?

• It cools and condenses to form clouds

• It remains in the atmosphere indefinitely

• It turns into salt and falls back into the ocean

• It directly falls as rain without forming clouds

Which ocean is the largest and deepest?

• Pacific Ocean

• Atlantic Ocean

• Indian Ocean

• Arctic Ocean

What percentage of Earth's water is contained in the oceans?

• Ninety-seven percent

• Seventy-one percent

• Fifty percent

• Eighty percent

What is the role of the ocean in the water cycle?

• It evaporates water that later falls as precipitation

• It absorbs all the rainwater and prevents flooding

• It provides fresh water directly to rivers

• It stores rainwater for future use

What is the average depth of the Pacific Ocean?

• About 3900 meters

• About 2000 meters

• About 5000 meters

• About 1000 meters