<p>Topic: What Is Our World Made Of?</p><p>1. The Earth:</p><p>- The Earth is the planet on which we live; it’s also referred to as the world or the globe. As one of the planets, the Earth is a sphere in shape.</p><p>- Our home and the home of billions of different life forms. Scientists have estimated that our little planet is now over 4.5 billion years old.</p><p>- As of January 2023, the world population is about 8 billion people</p><p>2.