Correct

鼎革

/ dǐnggé / 
Strokes

Definition

change of dynasties/clear out the old, bring in the new

Example

As a Verb

abolish the old and introduce the new; change dynasty

1
Tiāndì
天地
dǐnggé
鼎革

succession of the old by the new

2
Dǐnggé
鼎革
shíqī
时期

time of dynastic change