Ocean Acidification and Its Effects

The video explains ocean acidification, primarily caused by increased atmospheric CO2 levels. CO2 dissolves in ocean water, forming carbonic acid, which dissociates into hydrogen ions, reducing carbonate ions essential for marine life. This affects organisms like corals and mollusks that rely on carbonate for shell-building. The video discusses the chemical processes, the impact on marine ecosystems, and the role of human activities, particularly fossil fuel combustion, in exacerbating the issue. It highlights the projected decrease in ocean pH and its potential consequences for marine organisms.

What is the primary cause of ocean acidification?

• Increased levels of nitrogen in the atmosphere

• Increased levels of carbon dioxide in the atmosphere

• Decreased levels of oxygen in the atmosphere

• Increased levels of methane in the atmosphere

What compound is formed when CO2 dissolves in ocean water?

• Hydrochloric acid

• Nitric acid

• Sulfuric acid

• Carbonic acid

What ion is released when carbonic acid dissociates?

• Cl-

• OH-

• H+

• Na+

Why is the carbonate ion important for marine life?

• It is used to build shells

• It is used for respiration

• It helps in photosynthesis

• It is a source of food

What process do shell-building organisms undergo to form their shells?

• Photosynthesis

• Calcification

• Respiration

• Fermentation

What is the projected ocean pH by the year 2100?

• 8.2

• 7.8

• 8.1

• 7.5

How much has the ocean's average pH decreased in the past 150 years?

• From 8.1 to 7.9

• From 8.0 to 7.8

• From 8.2 to 8.1

• From 8.3 to 8.0

What is the primary driver of ocean acidification?

• Carbon dioxide emissions

• Nitrogen emissions

• Methane emissions

• Sulfur emissions

Which human activity contributes most to ocean acidification?

• Fishing

• Agriculture

• Combustion of fossil fuels

• Deforestation

What is the relationship between ocean pH and CO2 concentration in the atmosphere?

• No relationship

• Cyclic relationship

• Inverse relationship

• Direct relationship