How Heavy is the Earth? 地球有多重？

Learning different measurement methods can improve children's mathematical analysis skills! Explain in detail the methods of measuring the universe, nature, and daily things, and help you uncover the true face of everything in the universe! Today's growing emphasis on education science education, so children must be brought up to start learning scientific knowledge, to lay the foundation of scientific concepts. The book is divided into three chapters: the universe chapter, the natural world chapter and the daily things chapter, which introduces the measurement methods of different things. The earth, the sun, the moon, and the stars are all too big and too heavy. Is there any way to measure them? Through the universe chapter, the above problems can be solved, and children can understand the weight of the earth, the distance between the earth and the moon, the age of the universe, etc.; the nature chapter allows children to understand the natural world from a scientific point of view, an