A COMPARISON TO DETERMINE THE AGE SOMETHING BY OLDER OR YOUNGER.

THE ACTUAL AGE OF SOMETHING (OBJECT, PERSON)

A LAW OF ROCK LAYERS, WHICH UPPER LAYERS ARE YOUNGER AND LOWER LAYERS IS OLDER

FOSSILS ARE REMAINS OF ONCE LIVING ORGANISMS LIKE (TEETH,LEAFS AND SHELLS)

FOSSILS CAN SHOW WHAT THE CLIMATE USED TO LOOK LIKE, LIKE HOW SHARK FOSSILS HAVE BEEN FOUND IN MN. SUGGESTING IT WAS WARMER.

FOSSILS CAN SHOW US WHAT THE SURFACE LOOKED LIKE.

THERE IS FOSSILS, FROM DIFFERENT ERAS THAT CAN BE FOUND AREAS WHERE THE LIVING ORGANISM WOULD PROBROBLY NOT SURVIVE IN LIKE HOW CROC FOSSILS BEEN FOUND IN MN

THIS ERA STARTED 4.6 BILLION YEARS AGO, THERE WAS VERY LITTLE LIFE BECAUSE THE WORLD AT THAT TIME WAS MOSTLY LAVA AND MOLTEN ROCK.

THIS ERA STARTED 570 MYA, THIS WAS THE ERA OF SEA LIFE BECAUSE THE EARTH WAS FILLED WITH MOSTLY OCEANS. THE EARTH HAS COOLED DOWN TO LEVELS WE KNOW WHAT WE KNOW NOW.

THIS ERA IS KNOWN AS THE AGE OF THE REPTILE. THIS ERA LASTED ABOUT 180 MILLION YEARS. THE REASON WHY THIS AGE IS CALLED THE AGE OF THE REPTILE BECAUSE DINOSAURS WERE SO COMMON BACK THEN.

THIS WAS THE AGE OF THE MAMMALS BECAUSE MAMMALS WERE REALLY COMMON. THIS ERA STARTED 65 MYA TO NOW. THIS ERA HAPPENED DURING WHEN PANGEA BROKEN UP.

GRAMS

LITERS

METERS