What Happened to the Dinosaurs? February 24 th, 2015.
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Transcript of What Happened to the Dinosaurs? February 24 th, 2015.
What Happened to the Dinosaurs?
February 24th, 2015
Mystery
• What do we need when we are trying to solve a mystery?
Theories
• Mammal competition• Could the mammals have outcompeted
dinosaurs for food resources?
Theories
• Lots of Volcanism• Evidence for massive beds of ancient lava
found all around the world around 65 to 70 million years ago
Theories
• Plate Tectonics• Repositioning of the world’s landmasses was
disastrous for dinosaurs. As mountains formed, ocean currents were redirected and world sea level fell
Theories
• An asteroid• Ok…but
where is theevidence?
Evidence
• In 1981 two scientists Walter and his son Luis Alvarez find a very strange layer of iridium in Italy at the Cretaceous and Paleogene periods around 65 million years ago.
• They found this same layer all overthe world.
Evidence
• Iridium is a metal that is very rare on Earth’s surface but is commonly found in asteroids
• The layer of iridium at the Cretaceous Paleogene boundary had 100 X more Iridium than normal
If There Was an Asteroid Then There Must Be…
• An impact crater
Around the Same Time (1978)…
• A scientist working for a Mexican oil company was looking for new places to drill for oil using radar
• In his searching, he found a perfectly circular ring that is 70 km (40 miles) across under the ocean.
Let’s Go Down and Test Those Rocks!
• They tested the rocks and found them to be about 65 million years old, the same time as the Cretaceous-Paleogene extinction event
How Big Was The Asteroid?
• If the size of the crater was 70 km across…that must mean that the size of the asteroid was…
So if a Rock this Big Would Hit Earth What Would Happened?
Let’s Watch a Video…
• http://www.history.com/topics/why-did-the-dinosaurs-die-out
Content Take-Away
• Dinosaurs went extinct because of more than 1 reason:
• There was climate changes because of plate tectonic movement
• Lots of volcanism• Competition by mammals • Big asteroid
impact did NOT help…
Group A Group B Group C Group D Group E
Alimatou Sandeilis Daiana Antoneta Reyson
Henood Sharna Thanya Nathi Caroline
Misha Sadia Kimby Gabriela Katerina
Khady Maisha Megany Harold
Keyzie Obniel Robert
Unison Reading Groups Section 1
Group A Group B Group C Group D Group E Group FAnam Jubayer Ramzi Mosammat Dayana
Perla Ibrahim Jennifer Seme Victoria
Smarlyn Abdullah Maridania Keny Junior
Daze Sarmad Chris Humayra Kagbe
Yanvier Abdullah Besare Kaylin
Unison Reading Groups Section 2
Team 1 Team 2 Team 3 Team 4 Team 5
Thanya Megany Sandeilis Alimatou Sharna
Caroline Katerina Zoha Henood Maisha
Gabriela Kimberly Khady Daiana Sadia
Nathi Obniel Misha Keyzie Antoneta
Reyson Robert Harold Marbelin
Scarlet
Responsibility Teams Section 1
Team 1 Team 2 Team 3 Team 4 Team 5 Team 6Smaryln Ramzi Dajana Jennifer Chris Junior
Mikauly Geovani Anam Daze Victoria Sarmad
Maridania Abdullah N. Perla Besare Kagbe Abdullah Z.
Laura Ibrahim Blendi Yanvier Kaylin Jubayer
Mosammat Seme Humayra A. Francisco Humayera Z. Sumaiya
Responsibility Teams Section 2