TalkOrigins.org has many detailed rebuttals to creationist lies. This one hybridizes two topics, or maybe it’s a garbled version of CD210.

Grand Canyon: https://www.talkorigins.org/indexcc/CH/CH581.html https://www.talkorigins.org/faqs/icr-science.html https://www.talkorigins.org/indexcc/CD/CD210.html

Erosion: https://www.talkorigins.org/indexcc/CD/CD610.html https://www.talkorigins.org/indexcc/CD/CD620.html