In Appendix 6 of the book "The Biblical Basis for Modern Science", by Henry Morris, he gives a table listing 68 global processes that indicate a "young" age for the earth (some of these are given on this slide). None of these estimates are overly valid, for the same reasons that radiometric dating is not overly valid. That is, the assumptions of a uniform rate through all time, zero initial daughter component, and a completely closed system through all time are unlikely to be valid. However, the important point is that the vast majority of physical processes that affect the entire earth tend to point to an earth that is much less than the 4.6 billion years old typically given as its age.

For example, the process of salt build up in the ocean has been studied extensively by creationists and is fairly well understood (ICR Impact No. 8, "Evolution: Oceans Say No!", Nevins). When the most favorable parameters (for evolutionists) are used (no initial salt content in the ocean and minimum amount of salt entry per year), a value of only 76 million years is obtained as the MAXIMUM possible age of the earth. Of course, more reasonable parameters can date the earth by this process into the approximate 10,000 year age of the earth that strict creationism teaches.