April 3, 2013
#1194: Stratigraphic Record
[[A view of the Earth from space.]]
Nearly 4.5 billion years ago, Earth had liquid water. But all the crust older than 3.5 billion years has been recycled into the mantle by subduction.
[[The same view.]]
A billion years of the stratigraphic record, the memory of the hills, is forever lost to us. What was it
like
here, four billion years ago?
[[The same view.]]
Earth, what
secrets
do you have?
[[The same view.]]
Earth: come closer
[[A closer view.]]
[[An even closer view.]]
Earth:
i’ll never tell.