The drawing steps of unit 3 mind map in the second volume of ninth grade history are as follows:

1. Determine the central theme: take "the world at the beginning of World War I" as the central theme and put it at the center of the mind map.

2. Determine the main branches: according to the unit content, determine the main branches, such as World War I, Lenin and the October Revolution, the Treaty of Versailles and the Nine-Nation Convention, the socialist construction of the Soviet Union, and the upsurge of national democratic movement in Asia, Africa and Latin America.

3. Add details: Add relevant details for each main branch. For example, "World War I" can be further expanded into details such as "war background", "countries participating in the war", "major battles" and "influence".

4. Use graphics and colors: Use graphics and colors to enrich your mind map and make it more attractive. For example, colored lines and shapes can be used to represent different contents, or different colors can be used to distinguish different knowledge points.

5. Check and improve: After completing the mind map, check whether there are any omissions or mistakes and improve them.

Characteristics of mind mapping

Mind mapping is an effective tool because of its rigorous logic and deep memory, which can help us sort out and understand information and improve the memory effect. Through the guidance of logic, we can sort out scattered information, form a logical and orderly picture, and deepen our understanding of information.

At the same time, the mind map is also organized, which can be expanded in chronological order according to the theme, helping us to form a clear branch and knowledge system. Through mind mapping, we can organize a lot of information and form a memory framework, which is easier to understand and remember.

Mind mapping is expressed in the form of branches, each branch revolves around the central theme, and the expansion and divergence of branches echo each other. This divergent way of thinking allows us to look at problems from a broader perspective and avoid the shackles of fixed thinking. Through divergent thinking, we can think about the problem from multiple angles and find a more comprehensive solution.