Download or read book Composition Of The Earth: Children's Earth Science Book For Kids written by Bold Kids and published by FASTLANE LLC. This book was released on 2022-06-20 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you're wondering how the Earth is made, read on to find out. The Earth's outer layer is made up of solid rock and varies in thickness from three to forty-three miles. This solid layer is the largest, and it is the most dense part of the planet. The outer layer is made of lighter elements such as carbon, uranium, and iron. The inner core is made up of heavier materials and is almost two-thousand kilometers thick.