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  What Are the Phases of the Moon? 　　 　　Lunar phases Phases of the Moon as it orbits Earth, showing the angle formed by the position of the Moon with respect to the Sun at each phase. (more) What Are the Phases of the Moon? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/What-Are-the-Phases-of-the-Moon Feedback Corrections? Updates? Omissions? Let us...
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  Does It Rain on Other Planets? 　　 　　Venus The planet Venus experiences sulfuric acid rain, but due to the planet's heat, it evaporates before reaching the surface. (more) Does It Rain on Other Planets? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Does-It-Rain-on-Other-Planets Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article...
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  What Causes Acid Rain? 　　 　　Effects of acid rain Forest dieback caused by acid rain in the Jizera Mountains, Czech Republic. (more) What Causes Acid Rain? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/What-Causes-Acid-Rain Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a...
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  Why Is The Ocean Blue? 　　 　　Sailing the ocean blue Two sailboats on the dark blue waters of the Caribbean Sea, near Sint Maarten, West Indies (more) Why Is The Ocean Blue? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-Is-The-Ocean-Blue Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires...
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  How Are Mountains Formed? 　　 　　Cho La Pass in the Himalayas in Everest National Park, Nepal. The Himalayas were formed by the collision formed by the collision of the Indian and Eurasian tectonic plates. (more) How Are Mountains Formed? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/How-Are-Mountains-Formed Feedback Corrections? Updates? Omissions? Let us know if...
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  Why Is Summer Warmer Than Winter? 　　 　　Seasons in the Northern Hemisphere A diagram of the position of the Earth relative to the Sun during the solstices and equinoxes. (more) Why Is Summer Warmer Than Winter? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-Is-Summer-Warmer-Than-Winter Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve...
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  How Do Clouds Form? 　　 　　Cumulus clouds Rising warm air forms these puffy, low-altitude clouds which sometimes develop into storm clouds. (more) How Do Clouds Form? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/How-Do-Clouds-Form Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a...
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  Why Do Stars Twinkle? 　　 　　Sirius Sirius A and B (lower left) photographed by the Hubble Space Telescope. Sirius A is the brightest star in the night sky. (more) Why Do Stars Twinkle? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-Do-Stars-Twinkle Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this...
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  Why Do Humans Have Eyebrows? 　　 　　Eugene Levy Canadian actor and writer Eugene Levy, pictured here in 2023, has a stately set of eyebrows. (more) Why Do Humans Have Eyebrows? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-Do-Humans-Have-Eyebrows Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback...
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  What is Dark Matter? 　　What is Dark Matter? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/What-is-Dark-Matter Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for...
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  Why Do Snakes Shed Their Skin? 　　 　　Garter snake Common garter snake (Thamnophis sirtalis) shedding its skin. (more) Why Do Snakes Shed Their Skin? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-Do-Snakes-Shed-Their-Skin Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction...
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  Can Salamanders Regrow Body Parts? 　　 　　Western tiger salamander (Ambystoma mavortium) Western tiger salamander (Ambystoma mavortium). Salamanders can regrow their limbs and tail if they lose them. (more) Can Salamanders Regrow Body Parts? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Can-Salamanders-Regrow-Body-Parts Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article...
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  Why Do Giraffes Have Long Necks? 　　 　　Giraffe A lone giraffe in Kruger National Park, South Africa. (more) Why Do Giraffes Have Long Necks? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-Do-Giraffes-Have-Long-Necks Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction...
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  What’s the Difference Between Planets and Stars? 　　 　　Open cluster NGC 290 Stars in the open cluster NGC 290, as seen by the Hubble Space Telescope. (more) What’s the Difference Between Planets and Stars? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Whats-the-Difference-Between-Planets-and-Stars Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires...
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  How Was the Grand Canyon Formed? 　　 　　Carving a canyon The Colorado River, the architect of the Grand Canyon, continues to flow and carve as it has for six million years. (more) How Was the Grand Canyon Formed? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/How-Was-the-Grand-Canyon-Formed Feedback Corrections? Updates? Omissions? Let us know if you have suggestions...
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  Why Is Chicago Called the Windy City? 　　 　　The Windy City The Chicago skyline, with Soldier Field in the foreground and the Willis Tower rising over it. (more) Why Is Chicago Called the Windy City? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/topic/Why-Is-Chicago-Called-the-Windy-City Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article...
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  Why is Mars Called the Red Planet? 　　 　　Mars Earth's planetary neighbor Mars has been associated with the color red for centuries. (more) Why is Mars Called the Red Planet? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-is-Mars-Called-the-Red-Planet Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select...
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  How Do Electric Cars Work? 　　 　　Electric car connected to charging station A battery provides the energy needed to propel an electric car forward. The battery can be charged at a designated charging station. (more) How Do Electric Cars Work? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/technology/How-Do-Electric-Cars-Work Feedback Corrections? Updates? Omissions? Let us know if...
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  Why Do Cats Purr? 　　 　　Happy cat Purring can indicate a cat's contentment but may occur for other reasons as well. (more) Why Do Cats Purr? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/Why-Do-Cats-Purr Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a...
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  How Does Sound Travel? 　　How Does Sound Travel? Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/How-Does-Sound-Travel Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for...

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