Formation of Oceans on Earth Quiz

When did oceans form on Earth?

• After the appearance of life

• Early in Earth's history

• During the dinosaur era

• At the beginning of the human era

What was one of the sources of water for the formation of oceans?

• Gases from the sun

• Liquid water from underground reservoirs

• Gases (water vapor) from volcanoes

• Water imported by humans

How did water from comets and asteroids contribute to the formation of oceans?

• By bringing frozen water that melted on Earth

• By creating atmospheric water vapor

• By generating heat to evaporate existing water sources

• By transporting water in liquid form

What happens to tectonic plates over time that affects the oceans?

• They dissolve into the ocean water

• They cause the ocean volume to increase

• They move, leading to the formation of new oceans and the disappearance of old ones

• They prevent any changes in the ocean

Has the volume of water in the oceans changed over time?

• Yes, it has increased significantly

• Yes, it has decreased significantly

• No, it has remained constant

• The text does not provide this information

What is the average salinity of seawater?

• 25 parts per thousand

• 35 parts per thousand

• 45 parts per thousand

• 55 parts per thousand

How have minerals and salts been moved into rivers and streams?

• Evaporation of seawater

• Rain washing over rocks

• The flow of underground aquifers

• Melting of polar ice caps

What is the result of rivers and streams flowing into the ocean?

• Decrease in the ocean's saltiness

• Increase in the ocean's freshwater content

• Making the oceans salty

• Formation of new mineral deposits

What is the most abundant element shown in the pie chart?

• Sodium

• Chlorine

• Sulfate

• Magnesium

What percentage of the pie chart does Sodium represent?

• 55%

• 30.6%

• 7.7%

• 3.7%