Course outline
Module 1
Module 1: Introduction to Ocean Health
Introduction to Ocean Health
Knowledge check
Q1. What is the primary focus of ocean health?
- A. The economic value of oceans
- B. The overall condition and sustainability of marine ecosystems ✓
- C. The number of marine species
- D. The depth of the ocean
Why: Ocean health focuses on the overall condition and sustainability of marine ecosystems, ensuring they can support life and provide resources for future generations.
Q2. Which of the following is a major threat to ocean health?
- A. Increased sunlight
- B. Pollution and climate change ✓
- C. Increased fish populations
- D. Strong ocean currents
Why: Pollution and climate change are major threats to ocean health, affecting marine life and the balance of ecosystems.
Q3. What percentage of the Earth's surface is covered by oceans?
- A. 25%
- B. 50%
- C. 71% ✓
- D. 90%
Why: Oceans cover approximately 71% of the Earth's surface, making them a crucial component of the planet's health.
Q4. What is one of the main roles of oceans in the Earth's climate system?
- A. Producing fossil fuels
- B. Absorbing carbon dioxide ✓
- C. Increasing global temperatures
- D. Reducing biodiversity
Why: Oceans play a key role in the Earth's climate system by absorbing carbon dioxide, which helps regulate global temperatures.
Q5. Which of the following is a benefit of healthy oceans?
- A. Increased air pollution
- B. Improved water quality and biodiversity ✓
- C. Decreased fish populations
- D. Higher ocean temperatures
Why: Healthy oceans contribute to improved water quality and biodiversity, supporting both marine and human life.
Module 2
Module 2: The Role of Marine Biodiversity
The Role of Marine Biodiversity
Module 3
Module 3: Climate Change and the Oceans
Climate Change and the Oceans
Module 4
Module 4: Pollution and Its Impact
Module 5
Module 5: Overfishing and Sustainable Practices
Overfishing and Sustainable Practices
Module 6
Module 6: Ocean Acidification
Ocean Acidification
Knowledge check
Q1. What is the primary cause of ocean acidification?
- A. Increased carbon dioxide levels in the atmosphere ✓
- B. Pollution from industrial waste
- C. Overfishing
- D. Deforestation
Why: Ocean acidification is primarily caused by the absorption of excess carbon dioxide from the atmosphere by the ocean, which lowers the pH of seawater.
Q2. Which of the following is most affected by ocean acidification?
- A. Deep-sea organisms
- B. Marine plants
- C. Coral reefs ✓
- D. Mammals
Why: Coral reefs are highly sensitive to changes in ocean chemistry, and ocean acidification can weaken their structures and hinder their growth.
Q3. How does ocean acidification affect the ability of marine organisms to form shells and skeletons?
- A. It increases their ability to form shells
- B. It has no effect on shell formation
- C. It decreases their ability to form shells ✓
- D. It only affects certain species
Why: Ocean acidification reduces the availability of carbonate ions, which are essential for the formation of shells and skeletons in many marine organisms.
Q4. Which chemical reaction occurs when carbon dioxide dissolves in seawater?
- A. CO2 + H2O → H2CO3 ✓
- B. CO2 + H2O → HCO3- + H+
- C. CO2 + H2O → O2 + H2
- D. CO2 + H2O → CO + H2O2
Why: When carbon dioxide dissolves in seawater, it reacts with water to form carbonic acid, which is represented by the chemical equation CO2 + H2O → H2CO3.
Q5. What is the overall effect of ocean acidification on marine ecosystems?
- A. It has no significant impact
- B. It increases biodiversity
- C. It disrupts marine food webs and reduces biodiversity ✓
- D. It strengthens marine ecosystems
Why: Ocean acidification disrupts marine food webs by affecting the survival and growth of key species, which in turn reduces overall biodiversity in marine ecosystems.
Module 7
Module 7: Coastal Ecosystems and Human Interaction
Coastal Ecosystems and Human Interaction