地球是一个庞然大物,也是一个具有四十多亿年历史的行星。研究它的现状(包括由地表到地心)和发展历史,从而使我们充分利用它所能提供给我们的各种宝藏,防治多种自然灾害,保持人类生活的良好环境,是地球科学的主要目的。这是一项既有基础理论方面,也有实用方面的重要意义的工作。研究地球既容易入手,又难于了解它的全面情况和历史。说它容易,是因为很多情况是摆在地面上的,只要仔细观察就可以认识;运 The earth is a monster, and it is also a planet with a history of more than 4 billion years. Studying its status quo (from the surface to the center of the earth) and the history of development, so that we can make full use of the treasures it can provide to us, prevent and cure natural disasters, and maintain a good environment for human life. purpose. This is a work that has both basic theoretical and practical significance. Studying the Earth is not only easy to start but also difficult to understand its overall situation and history. It’s easy to say because many situations are on the ground. If you look closely, you can recognize it.