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Can you name three greenhouse gases? — Reading Comprehension

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RI.3.1
RI.4.1
4.ESS2.D

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This passage introduces children to three common greenhouse gases: carbon dioxide (CO2), methane, and water vapor. It explains their sources, such as car emissions for CO2 and cow digestion for methane. The text uses the analogy of a blanket to describe how these gases trap heat in Earth's atmosphere. By relating these gases to everyday experiences like car exhaust and steam from tea, the passage makes the concept of greenhouse gases more accessible to young learners.

CONTENT PREVIEW

3-greenhouse-gases — Greenhouse gases trap heat like a blanket around the Earth.

What Are Greenhouse Gases?

Greenhouse gases are gases in Earth's atmosphere that trap heat from the Sun. These gases act like a blanket around our planet, keeping it warm enough for plants, animals, and people to live. But if there are too many greenhouse gases, Earth can get too hot, leading to climate change.

The Three Main Greenhouse Gases

There are many greenhouse gases, but three are the most important:

1. Carbon dioxide (CO₂): This is the most talked-about greenhouse gas. It is released when people burn fossil fuels like coal, oil, and gas for energy. Carbon dioxide also comes from cutting down trees and making cement. Nature makes CO₂ too, from volcanoes, breathing, and rotting plants. Luckily, plants absorb CO₂ during photosynthesis.

2. Methane (CH₄): This greenhouse gas is much stronger than carbon dioxide at trapping heat—about 80 times stronger over 20 years! Methane comes from cows and other animals (from burps and manure), rice fields, landfills, natural gas leaks, and wetlands. There is less methane than CO₂ in the atmosphere, but it is powerful.

3. Water vapor (H₂O): Water vapor is the most common greenhouse gas and happens naturally. As the planet warms, more water evaporates into the air, which holds more heat. This creates a 'feedback loop'—more warming means more water vapor, and more water vapor means even more warming!

Other Greenhouse Gases

There are also other greenhouse gases like nitrous oxide (from fertilizers), CFCs (from old refrigerators and sprays), and ozone (when it is close to the ground).

Natural vs. Human-Caused

Earth needs some greenhouse gases to stay warm. Without them, our planet would be frozen. But humans are adding greenhouse gases too quickly, upsetting the balance and causing climate change. Most greenhouse gas emissions come from cars and trucks, making electricity, factories, farming, and buildings.

Greenhouse Gases Are Like Blankets

Think of greenhouse gases as blankets on your bed. One blanket keeps you cozy, but too many make you too hot!

Interesting Fact: The name 'greenhouse effect' comes from real greenhouses, which use glass to trap heat and help plants grow.

Which gas is released by burning fossil fuels?

Carbon dioxideOzoneWater vaporOxygen

What traps heat in Earth's atmosphere?

Greenhouse gasesRain cloudsMountainsOceans

Which is the most abundant greenhouse gas?

Water vaporNitrous oxideMethaneCFCs

What happens if there are too many greenhouse gases?

Earth gets too hotMore rain fallsPlants stop growingThe sky turns green

Why are greenhouse gases compared to blankets?