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Presentation transcript:

Quiz/Review Get out a small piece of paper and put your name on it. When the bell rings, the quiz will begin.

Question 1 When did the last major eruption of Mt. St. Helens occur?

Question 2 What killed most people in the major eruption of St Helens.

Question 3 What causes a major landslide?

Answers 1)1980 2)Lahar, pyroclastic flow, flooding, ash 3)Slope, precipitation, human impact

Mass Extinction Cretaceous–Paleogene extinction (K-T) What killed the dinosaurs? (Formally called the Cretaceous-Tertiary extinction)

Maps Meteor impact 65.5 million years ago.

What is…  A Meteor impact in Mexico 65.5 million years ago.  Killed 65-70% of all species on Earth.  90% of everything ever alive is now extinct! Extinctions are common.  Five major extinctions in the past and many smaller ones.

When…  Earth is 4.6 Billion Years old.  Life on Earth began in the Paleozoic (570 million years ago)  Dinosaurs were present on Earth around 245 million years ago and lived for about 180 million years.  Humans have only been on Earth for maybe 10,000 years!

Time line  Very controversial!  Some say fast (few years) some say slow (millions of years)?!  The fossil record is incomplete, so difficult to say something is present or not.

What causes this event?  Meteor (widely accepted)  Volcanism (flood basalts)  Deccan Traps (dark purple)  Climate Change  Atmospheric changes from other causes.  Sea level change  Sea level fell after 65 mya  Mega-Tsunami  Deposits of sea sediments in mountains of Mexico

Who is affected?  Marine Invertebrates - 60% species extinct.  Fish - 80% survived  Terrestrial Invertebrates – Not determined  Plants - 57% plants extinct  Amphibians – Most survived  Mammals -  Reptiles – Almost all species become extinct.  Two major survivors  testudines - turtles  lepidosaurs – lizards and snakes.

Facts  All current data and theories are based off of fossil evidence.  The K-T boundary is identifiable in North America:  By lack of ferns before, but abundant after.  Hell creek, Montana  Pollen levels in rocks and ice Hells creek formation

What If...  5 previous major mass extinctions  Some say we are in one now?  Climate change  Sea level change  Loss of resources  Over population

Works Cited  gene_extinction_event gene_extinction_event  c-world/mass-extinction/ c-world/mass-extinction/  _and_science-science/t/rock-solid-case-asteroid-killed- dinosaurs/ _and_science-science/t/rock-solid-case-asteroid-killed- dinosaurs/  an/extinctions.png an/extinctions.png