Answer:
The largest portion of earth is the mantle... If you're talking about Earth's surface it's water...
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The geological terrain of this region is primarily steppe, grasslands which have poor soil for agrarian (agricultural) lifestyles. Historically, steppe people have had to rob agricultural societies (i.e. Mongols in China) or just eat meat they hunt.
It's an air mass that develops over surface of a large body of water