Petrified wood

High school (ages 12+)
Environment & Earth

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/petrified-wood

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is petrified wood?Petrified wood is a stone copy of a real tree that shows the structure of ancient forests. It forms when the wood is replaced by minerals like silica. The tree’s cells stay visible in the stone.
2. How does a tree become petrified?First the tree is buried quickly in places with little oxygen, like floodplains or volcanic ash. Groundwater with minerals then fills the cells and slowly replaces the wood. The result is a stone version of the tree.

Diagenesis: The physical and chemical changes occurring in sediments after deposition and before metamorphism.
Lignocellulosic: Composed of lignin and cellulose, the primary structural components of plant cell walls.
Geochemical Proxy: A preserved physical or chemical characteristic of a past environment that can be analyzed to infer past conditions.