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Early Earth

Can you remember evolutionary terminology?

Castsmolds are filled by minerals
amberpreserved- entire intact organisms preserved in amber or ice
petrifiedhard parts replaced by minerals
trace fossilsfootprints, trails, or burrows
Relative datinglayers close to surface will be younger than deeper layers
radiometric datingused to find absolute dates. If you know how long an element takes to break down, you can estimate the age by how much of a certain element remains.
earth formed4.6 billion years ago
rocks formed3.9 billion years ago
first life forms3.5 billion years ago

Scott McCreary

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