Background: Ocean acidification occurs when excess carbon dioxide in the atmosphere causes the oceans to become acidic. Burning fossil fuels has led to an increase in carbon dioxide in the atmosphere. This carbon dioxide is then absorbed by the oceans, which lowers the pH of the water. Ocean acidification can kill corals and shellfish. It may also cause marine organisms to reproduce less, which could harm other organisms in the food chain. As a result, there also may be fewer marine organisms for humans to consume.

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean has a higher content of carbon dioxide in its waters?
Answer: Indian

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean has a lower content of carbon dioxide in its waters?
Answer: Arctic

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean experienced more water acidification over the last decade?
Answer: Indian

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean experienced less water acidification over the last decade?
Answer: Arctic

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean lost more corals because of its acidity?
Answer: Indian

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean lost fewer corals because of its acidity?
Answer: Arctic

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean lost fewer shellfish because of its acidity?
Answer: Arctic

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean lost more shellfish because of its acidity?
Answer: Indian

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean had more instances of marine organisms reproducing less?
Answer: Indian

Situation: The biologists found out that the Indian Ocean had a lower water pH than it did a decade ago, and it became acidic. The water in the Arctic ocean still had a neutral to basic pH.

Question: Which ocean had fewer instances of marine organisms reproducing less?
Answer: Arctic

Situation: Two islands were situated in different oceans. Hill island  used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed more to an increase in carbon dioxide levels?
Answer: Hill

Situation: Two islands were situated in different oceans. Hill island  used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed less to an increase in carbon dioxide levels?
Answer: Coral

Situation: Two islands were situated in different oceans. Hill island  used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed less to ocean acidification?
Answer: Coral

Situation: Two islands were situated in different oceans. Hill island  used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed more to ocean acidification?
Answer: Hill

Situation: Two islands were situated in different oceans. Hill island used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed more to the death of corals?
Answer: Hill

Situation: Two islands were situated in different oceans. Hill island used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed less to the death of corals?
Answer: Coral

Situation: Two islands were situated in different oceans. Hill island used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed less to the death of shellfish?
Answer: Coral

Situation: Two islands were situated in different oceans. Hill island used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island contributed more to the death of shellfish?
Answer: Hill

Situation: Two islands were situated in different oceans. Hill island used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island caused marine organisms to reproduce less?
Answer: Hill

Situation: Two islands were situated in different oceans. Hill island used fossil fuels and released a lot of carbon dioxide into the atmosphere, while Coral island was very protective towards the air and the ocean.

Question: Which island didn't cause marine organisms to reproduce less?
Answer: Coral