21st Century Student's Ten Thousand Whys: Our Earth. Various Weapons. Changing Celestial Phenomena (Includes CD-ROM)

Author: Shi Yongge
Publisher:
Publish Date: 2004-01-01
Features: The series introduces 12 aspects of content, including the animal world, botanical gardens, mysteries of the human body, weapon world, and celestial wonders. These topics cater to the curiosity of primary school students while considering their age and knowledge level. This volume provides detailed explanations on geographical phenomena: How was the Earth formed, how old is the Earth, and how thick is the Earth's crust; the weapon world: What is geophysical warfare, what is a birdman aircraft, and why can tanks attack and defend; celestial wonders: How high is the sky, have you ever seen a green sun, and why do three suns appear simultaneously at night.