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Climate change is making the Earth warmer—its air, oceans, land, and ice. That’s why it’s sometimes called global warming. This happens because an invisible gas called carbon dioxide enters the Earth's atmosphere and traps heat. People release carbon dioxide when we burn certain kinds of fuels (such as coal, oil, gas, and wood) to produce energy.
Climate change has other effects besides making things hotter. The same air pollution (carbon dioxide) that warms our planet also changes our oceans' chemistry. That’s because carbon dioxide dissolves into ocean water. Dissolving is a chemical reaction that occurs when a solid or gas completely mixes in with a liquid. If you’ve ever mixed sugar into hot water or tea, you’ve helped dissolve a solid (sugar) into a liquid (water). The sugar looks like it disappears, but it actually becomes part of the water solution.
When carbon dioxide dissolves into seawater, we can't see it. But it makes the ocean more acidic. This is known as ocean acidification. What is acidity? It’s hard to explain, but you may already know what it is if you’ve eaten acidic foods. Acidic foods, like lemons, often taste sour or tart. The ocean is so big and so salty that climate change won’t make seawater taste sour to us. But the chemical change still affects ocean animals, especially animals that live inside a shell, like snails, clams, mussels, and lobsters.
If shelled animals are hurt by climate change, then animals like birds that eat those animals are also harmed. This is one reason it's important to stop climate change: To protect all the ocean animals that live in shells and the ones that rely on them for food.
We need energy to create the electricity that powers our lamps, televisions, and air conditioners. That means that if we want to stop climate change and global warming, we need to find new sources of energy that don't create air pollution. Examples include solar panels, which turn sunlight into electricity, and wind turbines, which turn gusts of wind into electricity.
In this simple experiment, you will find out what happens to shelled animals when seawater gets too acidic. All you need is a few seashells and some items you can find in your kitchen.
Materials
Seashells
Glass containers
White vinegar
Water
Salt (optional)
Masking tape, Post-it notes, or other labels
Marker
Instructions
You're going to test how different liquids affect seashells when left in the liquid overnight. You need at least two seashells, but can test more liquids if you have more seashells at home.