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CH 8 SEC 3 RADIOACTIVE DATING GOAL/PURPOSE • EXPLAIN WHAT HAPPENS DURING RADIO ACTIVE DECAY. • DESCRIBE WHAT CAN BE LEARNED FROM RADIOACTIVE DATING • STATE THE PROBABLE AGE OF EARTH RADIOACTIVE DECAY • KEY- ROCKS ARE A SOLID FORM OF MATTER • ROCKS ARE MADE OF TINY PARTICLES CALLED ATOMS • ELEMENT- WHEN ALL ATOMS OF A PARTICULAR TYPE OF MATTER IS THE SAME • EX- CARBON, OXYGEN, LEAD…ETC RADIOACTIVE DECAY • RADIOACTIVE DECAY- THE PROCESS BY WHICH OVER TIME ELEMENTS BREAK DOWN, OR DECAY, BY RELEASING PARTICLES AND ENERGY. • KEY- DURING THE PROCESS OF RADIOACTIVE DECAY, THE ATOMS OF ONE ELEMENT BREAK DOWN TO FORM ATOMS OF ANOTHER ELEMENT • KEY – SCIENTIST USE RADIOACTIVE DECAY TO DETERMINE THE AGE OF ROCKS WHERE IS THE OLDER RACK LAYER? HOW OLD IS EARTH? • KEY- OLDEST ROCKS ARE ABOUT4 BILLION YEARS OLD • KEY- RADIOACTIVE DATING SHOWS EARTH IS OLDER BECAUSE MOON ROCKS ARE ABOUT 4.6 BILLION YEARS OLD. SO SCIENTIST BELIEVE THE EARTH IS ABOUT 4.6 BILLION YEARS OLD! Q AND A • • • • 1-AB 2-AB 3AB http://www.brainpop.com/science/earthsyst em/geologictime/ • http://www.brainpop.com/science/diversity oflife/fossils/