While walking along the beach, Evelyn notices bubbles forming where the waves crash. She wonders what happens when carbon dioxide mixes with seawater. What is formed?

Maya is learning about ocean acidification in her science class. She asks her teacher what the H+ ion is. What is the correct answer?

Sophia is studying marine biology and observes that marine organisms make their shells from calcium and

Scarlett is visiting an aquarium and learns about marine organisms that need calcium carbonate to build their shells or skeletons. Which of the following is an example of such an organism?

During a science class, Isla learns that very slight increases in the acidity of seawater __________  marine organisms that make shells.

Aria is reading about how carbon dioxide levels in the air have changed throughout earth's history.  She learns that the difference today is how ______ the change is happening.

Kai is conducting an experiment to find out which molecule makes water acidic. Which molecule should Kai add to water to make it acidic?

Scarlett is reading about greenhouse gases and learns that a significant portion of them don't stay in the atmosphere. What happens to 1/4 of the greenhouse gases in the atmosphere?

Ava is studying ocean acidification and observes that carbon dioxide ions react with water. What molecules do they release?

Anika is studying ocean acidification and comes across this slide in her marine biology class. Based on the information shown, what impact does CO₂ have on marine life?

Aiden is studying the relationship between atmospheric CO₂ and ocean chemistry using the data shown in this image. What does the image demonstrate?

Evelyn is studying ocean acidification for her science project. She learns that as the ocean becomes more acidic, the pH of the water

Mia is studying marine biology and learns that some marine creatures interact with the carbonate ion in the ocean. What do these creatures do with the carbonate ion?

While walking along the beach, Ava notices bubbles forming where the waves crash. She wonders what happens when carbon dioxide mixes with seawater. What do they combine to form?

Henry is learning about environmental issues in school. He discovers that burning carbon-based fossil fuels releases a certain gas into the atmosphere. What gas is released?

Mia is learning about carbon dioxide in her science class. She wonders if all the carbon dioxide gas found in the ocean is there because humans are causing pollution from burning fossil fuels. What do you think?

Mia is visiting an aquarium and learns about marine organisms that need calcium carbonate to build their shells or skeletons. Which organism does Mia discover needs calcium carbonate?

Noah is studying the effects of acidification in the ocean. What is a possible consequence for marine organisms?

Abigail is studying ocean acidification and reads The 6th Extinction chapter. She wants to know which organism is considered a calcifier. Which should she choose?

While exploring a lake, Mia notices bubbles rising from the water. She wonders what happens when carbon dioxide from the air combines with the water in the lake. What does this reaction create?

Scarlett is studying coral reefs and notices that many corals are turning white. She learns that certain toxic things can cause coral bleaching. What are some toxic things that have caused coral bleaching?

Charlotte is reading about ocean acidification and wonders what it will affect. What will ocean acidification affect?

Aria is studying the effects of ocean acidification on marine life. She observes that bacteria and fish populations are changing. How are bacteria and fish being affected by ocean acidification?

Emma is reading about how burning fossil fuels, human activities, and climate change are affecting the oceans. She learns that these factors contribute to a process called ocean acidification. Ocean acidification is related to...

Benjamin is conducting an experiment where he bubbles carbon dioxide gas into a container of water. What happens to the water as a result?

While visiting a nature reserve, Nora observes a wide variety of plant and animal life in the area. She learns that this variety is called ____________________.

Emma is studying marine life and discovers that some marine creatures interact with the carbonate ion. What do these creatures do with the carbonate ion?

Jackson is a marine biologist studying how ocean acidification affects marine life. He observes that ocean acidification makes it more difficult for marine organisms to hear each other, and predators.

Aria is studying how ocean acidification affects marine life. She observes that in a more acidic ocean, the shells of organisms do not grow as easily.

Mason is reading about ocean acidification and wonders if it raises the pH of the ocean.

Mason is studying ocean acidification and wants to identify which chemical is carbonate among the substances he found. Which is carbonate?

David is studying ocean acidification. He observes that when CO2 dissolves in seawater, it reacts with H2O. What is the product of this reaction?

Ava is learning about ocean acidification in her science class. She discovers that the H+ ion plays a key role in making seawater more acidic. The H+ ion is a(n)

Charlotte is studying marine organisms and learns that they make their shells from calcium and __________. What substance do they use?

Ava is driving her car to work. The process that occurs when the fuel in her car burns to power the engine is called 

Abigail is reading about climate change and learns that one greenhouse gas is present in very high quantity in the atmosphere. Which gas is it?

Ava is learning about climate change in her science class. Her teacher asks her to identify which of the following are greenhouse gases. Which option should Ava choose?

James is studying ocean water samples and uses a graph to track changes over time. The graph shows two lines: a blue line and an orange line. What does the blue line show?

Mia is studying a graph about ocean acidification. She notices an orange line on the graph and wants to know what it represents. What does the orange line show?

Ava is studying ocean water samples collected in Hawaii between 1989 and 2014. She observes the pCO2 levels in the samples. What happened to the pCO2 during this period?

Lily is studying ocean water samples collected in Hawaii between 1989 and 2014. What happened to the pH during this period?

Abigail is studying ocean water samples and notices that as the pH of the water decreases, something happens to the pCO2. What does Abigail observe?

Noah is testing the pH of ocean water and finds that it has a pH of 8.1. What does this pH value mean?

Harper is studying the ocean and notices that its pH is decreasing. What is happening to the ocean?

Noah is studying ocean acidification and wants to know the pCO₂ level in ocean waters around 1994. What was the pCO₂ around 1994?

Zoe is studying ocean acidification and wants to know what the pH of ocean water was around 1989. What was the pH at that time?

James is studying the relationship between CO₂ concentration and pH in ocean waters using a scatter plot. He wants to find a line of best fit (or "trend" line) that best represents the data on his graph.

This line may pass through some of the points, none of the points, or all of the points. What represents the line of best fit in this graph?

Liam is studying the relationship between atmospheric CO₂ and seawater chemistry using the graph above. This image demonstrates that

Mia is studying ocean water samples and notices that as the pH of the water decreases, the concentration of CO₃^2- (carbonate) changes. Which statement accurately describes what Mia observes in her experiment?

Lily is testing the water in her fish tank and finds that it has a low pH. What does this mean about the water?

Scarlett is testing the water in her aquarium to ensure it is safe for her fish. She uses a pH meter to measure the water. What does the pH value indicate?

Emma is studying ocean acidification for her science project. She discovers that the ocean's pH has gone from _____ to _____ over the last century.

Aria is conducting an experiment by placing the calcium carbonate shells of pterapods in seawater with a pH of 7.8, which is the projected ocean pH for the year 2100 under current rates of acidification. CaCO₃ _____ at a lower pH (image shows the results of her experiment).

Avery is studying ocean water samples and notices that as the amount of dissolved carbon dioxide (pCO₂) increases, the pH changes. According to the graph, what happens to the pH as pCO₂ increases?

Grace is studying the effects of increased ocean acidity on marine life. She observes that some marine organisms are affected by the change. Which of the following is a direct effect of increased ocean acidity on these organisms?

Scarlett is studying the changes in the ocean and notices that the water is becoming more acidic. What is the main cause of ocean acidification?

Nora is studying the effects of ocean acidification and notices that carbonate ion concentrations are declining. Which marine organism is most at risk from this change?