preservation articles
What critical condition must an organism meet immediately after death to have a chance at fossilization?
What type of environment is ideal for the rapid burial necessary for early fossilization?
In the process of permineralization, what happens to the hard parts of the organism?
How does the process of replacement differ from permineralization?
What is the result when an encased organism dissolves completely, leaving behind an empty void shaped like the original?
What chemical transformation leaves behind a thin, dark film of nearly pure carbon for soft-bodied organisms?
In which type of rock are fossils rarely preserved, and why?
What does the Principle of Superposition state regarding undisturbed rock layers?
If a fossil cannot be dated directly, how is its age typically bracketed using absolute dating methods?
What usually causes a fossil to appear cleanly split into two halves across a bedding plane after excavation?
What is the primary component of US pennies minted after 1982?
What percentage of copper do pennies manufactured before 1982 contain?
What typically clogs the vascular system of a flower stem, causing it to wilt?
What is the theoretical function of copper leaching into vase water for flower preservation?
Besides a biocide, what two other elements do commercial flower food packets typically provide?
Approximately what fraction of a post-1982 penny is composed of copper?
What key component do pennies fail to provide that commercial flower food offers?
If attempting the copper coin trick, which coin is scientifically the better candidate?
What common item containing salicylic acid is sometimes suggested to sanitize vase water?
What routine maintenance step is still essential even if a coin is placed in the vase water?