Transcript CH 8 SEC 3

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
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1-AB
2-AB
3AB
http://www.brainpop.com/science/earthsyst
em/geologictime/
• http://www.brainpop.com/science/diversity
oflife/fossils/