Describe one example of a pattern of Mongolian expansion in the period 120-1450

The growth of the empire reaching Europe on its greatest extent.

Explanation:

When Genghis Khan first took control of the Mongol Empire it started absorbing other tribes and adding them to their empire by force or alliances, the extent of the empire would begin in the pacific ocean and reach what we now know as India, but after Genghis Khan's death his hears would take it to a new extend conquering parts of Europe too, that's one example of the pattern on mongolian expansion.