Hundreds of kilometers of roots

This is mind-blowing:

When we are asked to draw a tree, we tend to draw the trunk and leaves,

missing out 30% of the tree:

the roots.

And yet, trees can have hundreds of kilometers of roots!

Imagine that! 

My head can't get round it yet.

Sources: 

http://arnoldia.arboretum.harvard.edu/pdf/articles/1989-49-4-tree-roots-facts-and-fallacies.pdf

https://www.extension.iastate.edu/news/2006/apr/4-28-06GardenColumn.htm