An Overview of Earth History The Earth has been around for
approximately four and a half billion years! The geologic time
scale is the timeline that describes all this time. Scientists
have found rocks that formed during every time period of Earth's
history! In sedimentary rocks, they have found millions of
fossils and clues to past environment. Take a look at the
stories below to discover how some scientists are discovering
more about our planet's past. Missing Link Between Whales and
Four-Footed Ancestors Discovered Did Life First Form in a Mica
Sandwich at the Bottom of an Ancient Sea? Using Leaves From the
Past to Tell the Future! Digging Woolly Rhinos Did T-Rex Have a
Plant-Eating Relative? Diamonds are Ancient History Geologic
Findings Undermine Theories of Permian Mass Extinction Timing
Old Rocks Give New Clues about Ancient Earth Evolution Hits the
Beach - streaming RealVideo (1 min. 7 sec.) from NSF The History
of the Universe in 60 Seconds or Less - Dr. Eric Schulman -
streaming RealVideo (1 min. 16