THE CRA PERSPECTIVE • EARTH SCIENCE How Much Water Is There on Earth? Can our planet ever run out of water? Exploring Earth's enormous water reserves, the freshwater shortage and the future of humanity. Water is one of the most extraordinary and essential resources on our planet. Our planet is called the Blue Planet for a reason. Approximately 71% of Earth's surface is covered by water. But does that mean we have an unlimited supply of water for human survival? Look at the oceans, rivers, lakes, glaciers and countless streams across the world. Water seems almost endless. It falls as rain, flows through rivers, disappears into the ground, freezes into ice and rises into the atmosphere as water vapour. Yet billions of people experience water shortages. Some communities struggle to obtain safe drinking water, groundwater reserves are declining in several regions, and pollution is making important water sour...
The Great Wall of China is one of the most iconic landmarks on Earth, stretching across mountains, deserts, and grasslands. Built over centuries, it is not just a wall—it’s a symbol of resilience, culture, and human determination. But beyond its towering stones lie myths, fascinating facts, and secrets still unknown to many. 🏯 A Brief History The Great Wall wasn’t built in one go. It began as smaller defensive walls by various Chinese states around the 7th century BCE. Emperor Qin Shi Huang (the first emperor of China) connected many of them around 221 BCE, and later dynasties, especially the Ming (1368–1644), rebuilt and expanded it into the structure we recognize today. 🌟 Common Myths About the Great Wall 1. Myth: The Great Wall is visible from space with the naked eye Truth: While impressive in size, the wall is relatively narrow and blends into the natural landscape. Astronauts, including those from NASA, confirm it’s not visible without aid. 2. Myth: The Wall is a ...