The y-axis show percentage of landscape occupied by a forest stage.
The cambium produces a new layer of wood each year as woody plants grow in diameter. This layer is referred to as the annual ring or growth ring. The age of a tree can be determined by counting the rings. Dendrochronology is the use of tree-ring dating to determine the age of a tree. Mitchell's rule, which assumes that a tree's girth expands by around 2.5 cm per year, aids in calculating a tree's age. This means that you can calculate the age of a tree by measuring its girth and dividing it by 2.5.
The Yellowstone Plateau Volcanic Field, also known as that of the Yellowstone Supervolcano or even the Yellowstone Volcano, is indeed a complex volcano, volcanic plateau, and volcanic field located primarily in Wyoming but also extending into Idaho and Montana. It's a popular tourist destination.
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