Earth Science Review November 2023

What is the largest ocean on Earth?

• Pacific Ocean

• Atlantic Ocean

• Indian Ocean

• Arctic Ocean

What is the average salinity of seawater?

• 10‰

• 20‰

• 30‰

• 35‰

Which of the following is the major constituent of seawater?

• Calcium carbonate

• Sodium chloride

• Potassium nitrate

• Magnesium sulfate

What is the primary cause of coral bleaching?

• High salinity

• Low temperature

• Ocean acidification

• Excessive sunlight exposure

What is the term for the reduced concentration of dissolved oxygen in a water body?

• Hypoxia

• Eutrophication

• Acidification

• Desalination

What is the main source of pollution in the ocean?

• Volcanic eruptions

• Natural oil seeps

• Industrial waste

• Marine organisms

What is the process of growing aquatic organisms for human consumption called?

• Aquaculture

• Mariculture

• Hydroponics

• Horticulture

What is the term for unintended catch in commercial fishing?

• Bycatch

• Overfishing

• Trawling

• Dredging

What is the main cause of the dead zone in the Gulf of Mexico?

• Oil spills

• Plastic pollution

• Excessive fishing

• Nutrient runoff

What is the main cause of currents in the ocean?

• The rotation of the Earth

• The temperature of the water

• The salinity of the water

• The wind over the ocean