The Impact of Human Activity on Coral Reefs and Aquatic Ecosystems

The video discusses the impact of human activities on aquatic environments, focusing on coral reefs, oil spills, and oceanic dead zones. It explains how climate change leads to coral bleaching, how oil spills affect ecosystems, and how agricultural runoff creates hypoxic zones. The video highlights the interconnectedness of ecosystems and the far-reaching effects of pollution.

What is the primary material that coral reefs are made of?

• Magnesium sulfate

• Sodium chloride

• Calcium carbonate

• Silicon dioxide

Why are coral reefs important to marine life?

• They produce oxygen for land animals.

• They reduce the salinity of seawater.

• They increase ocean temperatures.

• They provide food and shelter to marine organisms.

What is a visible sign of coral reef stress?

• Increased fish population

• Bleaching of the coral

• Growth of seaweed

• Formation of new coral

How do oil spills primarily affect birds?

• They make birds more colorful.

• They help birds find more food.

• They prevent birds from flying and swimming.

• They increase birds' lifespan.

What is a hypoxic zone?

• An area with high salinity

• An area with high oxygen levels

• An area with low salinity

• An area with low oxygen levels

What human activity contributes to the formation of oceanic dead zones?

• Overfishing

• Fertilizer runoff

• Urban development

• Deforestation

What happens when algae die and decompose in the ocean?

• They form new coral reefs.

• They deplete oxygen in the water.

• They increase the water's temperature.

• They release oxygen into the water.

What is one of the effects of mercury in aquatic environments?

• It makes the water highly toxic.

• It increases the water's oxygen levels.

• It promotes fish growth.

• It makes the water more acidic.

How can waste from Chicago affect aquatic environments far away?

• It can reduce water pollution.

• It can increase fish populations.

• It can improve water quality.

• It can cause oceanic dead zones.

What is a common source of pollution in aquatic environments?

• Natural disasters

• Elemental mercury

• Solar radiation

• Wind erosion