
1) Action 2) Activity 3) Fossilisation 4) Natural action 5) Natural process
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https://www.crosswordclues.com/clue/fossilization

1) Fossilisation 2) Petrifaction 3) Petrification
Found on
https://www.crosswordclues.com/clue/fossilization
[linguistics] In linguistic morphology, fossilization refers to two close notions. One is preserving of ancient linguistic features which have lost their grammatical functions in language. Another is loss of productivity of a grammatical paradigm (e.g., of an affix), which still remains in use in some words. Examples of fossilization includ...
Found on
http://en.wikipedia.org/wiki/Fossilization_(linguistics)

• (n.) The process of converting, or of being converted, into a fossil.
Found on
http://thinkexist.com/dictionary/meaning/fossilization/

The process of an organic substance being transformed into a fossil.
Found on
http://www.encyclo.co.uk/local/22291
Fos`sil·i·za'tion noun [ Confer French
fossilisation .] The process of converting, or of being converted, into a fossil.
Found on
http://www.encyclo.co.uk/webster/F/67

[
n] - the process of fossilizing a plant or animal that existed in some earlier age 2. [n] - becoming inflexible or out of date
Found on
http://www.webdictionary.co.uk/definition.php?query=fossilization

fossilization, fossilisation (UK) 1. The process of fossilizing a plant or animal that existed in some earlier age. 2. The process of being turned to stone. 3. Becoming inflexible or out of date. Fossilization is considered a rare occurrence because most components of formerly-living things tend to decompose relatively quickly following death. ...
Found on
http://www.wordinfo.info/words/index/info/view_unit/851/
fossilisation noun becoming inflexible or out of date
Found on
https://www.encyclo.co.uk/local/20974

All the processes that involve the burial of a plant or animal in sediment and the eventual preservation of all, part, or a trace of it.
Found on
https://www.encyclo.co.uk/local/21202

In order for an organism to be fossilized, the remains normally need to be covered by sediment as soon as possible. Additionally, an organism can become petrified when it comes to rest in an anoxic (oxygen-free) environment such as at the bottom of a lake or sea-bed.
Found on
https://www.encyclo.co.uk/local/22070
No exact match found.