Earth Day is April 22, and Arbor Day is April 29. This week, learn about the WONDERS of planet Earth and explore topics that can help you make the world a better place.

Earth Facts

• Wonder of the Day #1653: Is Earth Called the Same Thing in Every Language?
• Wonder of the Day #2067: Is Planet Earth Alive?
• Wonder of the Day #1204: How Many People Are on Earth?
• Wonder of the Day #1292: How Did Earth Begin?
• Wonder of the Day #1277: Why Is Earth Round?
• Wonder of the Day #2630: How Is the Human Body Like Planet Earth?
• Wonder of the Day #937: Why Do We Need Trees?
• Wonder of the Day #667: Why Are Rainforests Important?

Climate

• Wonder of the Day #2356: What Is Climate Change?
• Wonder of the Day #2880: Is Antarctica Melting?
• Wonder of the Day #245: What Is the Ozone Layer?
• Wonder of the Day #908: Are All Forest Fires Bad?
• Wonder of the Day #2474: Was the Sahara Once a Green Oasis?
• Wonder of the Day #2453: What Is Overgrazing?
• Wonder of the Day #1586: Do Glaciers Still Exist?

Energy

• Wonder of the Day #613: What Is a Hybrid?
• Wonder of the Day #1427: What Are Fossil Fuels?
• Wonder of the Day #1025: Can You Make Electricity with Water?
• Wonder of the Day #1851: Can We Produce Energy by Exercising?
• Wonder of the Day #732: What Is a Wind Farm?
• Wonder of the Day #1598: What Is Geothermal Energy?
• Wonder of the Day #1438: How Does the Sun Make Energy?

Recycling

• Wonder of the Day #784: Where Is the World’s Largest Pile of Trash?
• Wonder of the Day #2140: What Types of Things Can You Recycle?
• Wonder of the Day #1962: What Happens to Old Tires?
• Wonder of the Day #2276: How Long Does It Take Plastic to Decompose?
• Wonder of the Day #741: What Is Compost?
• Wonder of the Day #1039: How Is Glass Recycled?
• Wonder of the Day #434: Where Does Sea Glass Come From?

Endangered Species

• Wonder of the Day #152: How Does a Species Become Endangered?
• Wonder of the Day #1233: Why Are Pandas Rare?
• Wonder of the Day #2133: Will Humans Become Extinct?
• Wonder of the Day #2495: How Is Coral Made?
• Wonder of the Day #1073: How Great Is the Great Barrier Reef?
• Wonder of the Day #2372: Is an Axolotl a Fish or an Amphibian?
• Wonder of the Day #807: How Big Do Cats Get?
• Wonder of the Day #2079: Why Are Some Tigers White?
• Wonder of the Day #1581: What Is an Invasive Species?
• Wonder of the Day #633: Can a Human Outrun a Cheetah?
• Wonder of the Day #1046: How Strong Are a Crocodile’s Jaws?
• Wonder of the Day #1165: What Is the Gold of the Andes?
• Wonder of the Day #1099: How Rare Is the Rhino?
• Wonder of the Day #677: Where Are the Galapagos Islands?
• Wonder of the Day #789: Can You Ride a Seahorse?
• Wonder of the Day #2863: Can People Save Endangered Species?

Individual Action

• Wonder of the Day #2631: Who Was Wangari Maathai?
• Wonder of the Day #2555: How Did Environmentalism Start?
• Wonder of the Day #2326: How Do Mobile Phones Affect the Ecosystem?
• Wonder of the Day #58: What Is a Letter Writing Campaign?
• Wonder of the Day #1483: Do You Leave a Trace?
• Wonder of the Day #1654: Why Should We Reduce Our Plastic Waste?
• Wonder of the Day #567: What’s So Great About Going Green?
• Wonder of the Day #2768: Would You Want a Spekboom Plant?
• Wonder of the Day #2838: Can We Reverse Carbon Emissions?
• Wonder of the Day #1675: How Can You Make Earth a Better Place?
• Wonder of the Day #932: How Big Is Your Carbon Footprint?

WONDERing about a topic we haven’t covered? Submit your question to the Wonder Bank.