Understanding Oceans and Their Impact

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

• 80%

• 70%

• 60%

• 50%

How do oceans help in regulating the Earth's climate?

• Through their swirling currents

• By reflecting solar radiation

• By absorbing sunlight

• Through volcanic activity

What is the effect of carbon dioxide reacting with seawater?

• It creates oxygen

• It forms carbonic acid

• It produces methane

• It generates hydrogen

Why is rising acidity in oceans a concern for marine life?

• It causes water to evaporate faster

• It reduces sunlight penetration

• It makes it difficult for organisms to form shells

• It increases water temperature

What happens to ocean water as it warms?

• It becomes denser

• It loses salinity

• It contracts

• It expands