tuesday 5/3/11 how the earth was made. content objectives 1.we will learn about how scientists have...
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Language Objectives 1.We will use reading, discussion and writing to learn about the history of Earth.TRANSCRIPT
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Tuesday 5/3/11
• How the Earth Was Made
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Content Objectives
1.We will learn about how scientists have determined the age of the Earth.
2.We will learn about the history of Earth over time.
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Language Objectives
1. We will use reading, discussion and writing to learn about the history of Earth.
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Schedule
• Agenda, objectives 5 min.• Intro. to geologic methods for
dating rocks 10 min.• Video 25 min.• Discussion 10 min.
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How do scientists KNOW things?
• Observations• Experiments• Inferences
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Relative Dating (this rock is older than that rock)
• Most of the time the rocks on the top are older than the rocks on the bottom
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Absolute Dating(this rock is 28 million years old)
• Some atoms are not stable—they break down into “daughter” atoms
• Ex.: Uranium changes into a form of lead at a constant known rate
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Oldest Rock
• Oldest rocks on Earth are the Acasta Gniess of northern Canada • 4.03 billion years old
© NASA
Acasta Gneiss
Zircon mineral
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Oldest Zircon Grain
4.4 byzircon grain
www.geology.wisc.edu/zircon/Earliest%20Piece/Images/2a-team.jpg
© NASA
• Ancient mineral grain found at Jack Hills, Australia • Mineral grain eroded from first crust and then deposited in a new rock
• Dates the Earth’s first crust to around 4.4 billion years
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Meteorites
• Radiometric age of meteorites date the formation of the Solar System and Earth (4.55 billion years old)
en.wikipedia.org/wiki/Image:Canyon-diablo-meteorite.jpg
http://upload.wikimedia.org/wikipedia/commons/0/00/Crab_Nebula.jpg
Crab Nebula
Canyon Diablo meteorite