Is this correct? Southern Asia is more mountainous than Northern Asia?

It is mostly correct. Look at the map.

http://maps.howstuffworks.com/world-mountain-ranges-map.htm

The sentence is grammatically correct, but you'd have to be clearer about what you mean as "southern" and "northern" Asia to know if the content of your statement is correct.

http://www.google.com/search?rlz=1C1GGGE_enUS379US379&sourceid=chrome&ie=UTF-8&q=mountains+in+asia

To determine whether Southern Asia is more mountainous than Northern Asia, we need to gather information about the topography of these regions and compare them.

To get this information, you can use various resources such as maps, geographical databases, or research articles. Let's break down the steps:

1. Understand the geographical division: Southern Asia generally refers to countries located south of the Himalayas, including countries like India, Pakistan, Bangladesh, Sri Lanka, Nepal, and Bhutan, among others. Northern Asia typically includes countries like Russia, Kazakhstan, Mongolia, and parts of China.

2. Analyze the mountain ranges: Look at the major mountain ranges in both regions. Some prominent mountain ranges in Southern Asia include the Himalayas, the Western Ghats, the Eastern Ghats, the Aravalli Range, and the Hindu Kush. In Northern Asia, you'll find mountain ranges like the Ural Mountains, the Altai Mountains, and the Sayan Mountains.

3. Compare the characteristics: Consider factors like elevation, average height, and overall extent of the mountains in each region. Assess whether there are more extensive or higher mountains in one region compared to the other.

4. Consider other landforms: Remember that mountainous terrain is not the only indicator of topographical differences. Northern Asia, for example, has vast stretches of flatlands like the Siberian plains and the Kazakh Steppe, while Southern Asia has diverse landscapes like the Gangetic plains and coastal regions.

By following these steps and gathering information on the mountain ranges and overall topography of Southern Asia and Northern Asia, you can determine which region is more mountainous.