災變說

catastrophism (theory that geological changes are brought about by catastrophes such as the biblical flood)

disaster / calamity

catastrophe / cataclysmic change

to change / to become different / to transform / to vary / rebellion

to persuade

to speak / to say / to explain / to scold / to tell off / a theory (typically the last character in a compound, as in 日心說|日心说 heliocentric theory)

to speak; to talk; to say / to explain; to comment / to scold; to tell off / (bound form) theory; doctrine