Name: Per.: Date: Mass Extinctions On Earth Over Time

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Name:Per.:Date:Mass Extinctions on Earth over TimeObjective: Identify the timing of mass extinctions and research their causes.Procedure: Use the data below to create line graph that illustrates the number offamilies (groups of related organisms) on Earth over the past 525 million years.DataMillions of years agoNumber of Families (Related groups of species)(x axis)(y 523521022038020524010055080600655300760

Name:Per.:Date:Mass Extinctions on Earth over TimeObjective: Identify the timing of mass extinctions and the causes of massextinctions.Part 1: Identifying Mass Extinctions on a GraphDirections: IDENTIFY and LABEL each mass extinction you see on yourgraph. Write the approximate time of each mass extinction on the graph whereit occurs. Write the name of each mass extinction on the graph (“PermianTriassic” for example). You will determine the names through yourresearch.Part 2: Internet ResearchBBC's NATURE: The Big 5 Extinctions: eventsUse this article to research the possible causes of specific mass extinctions.BBC's NATURE: Mass Extinction Causes causesUse this article to research HOW methane release, flood basalts, climate change, and impact events causeextinctions.Select ONE of the mass extinctions you identified to research. Yourresearch should include the following details:1. Name of extinction and when it happened2. What percentage of species went extinct (Overall, Marine, and/orTerrestrial).3. Identify the types of species that were most negatively affected.4. What was the cause or causes of each mass extinction? Providedetails on how these causes actually caused species to goextinct (Ex: How do flood basalts cause extinctions?) Summarize your research in paragraph form (Topic sentence,details, closing sentence). Summaries should incorporateresearched facts and details.

Part 3: Sixth Mass Extinction?Today many biologists think we are going through ANOTHER extinction eventthat HUMANS are causing. Research the possibility of a human-caused massextinction.Links:VideoPBS 6th Mass Extinction (9 min) z9gHuAwxwAsEgghead’s: Are We Facing a Sixth Mass Extinction? (3 mins) INWqAABweTgArticlesBBC’s: A Looming Mass Extinction Caused by ooming-mass-extinctionDiscovery News: World’s Sixth Mass Extinction May Be Under -events/mass-extinction-humans-animals110303.htmIn paragraph form address the following questions.1.How can humans be causing a possible mass extinction? What humanactivities are causing extinctions? Explain.2. What organisms are on the losing end of this hypothesized massextinction?3. Even if humans are not the cause of a mass extinction, do you thinkanother mass extinction is possible? Probable? Why or why not? Defendyour answer with reasons.Mass Extinction ActivityGraph Mass extinctions labeled with estimated timePoints5

and name.Research Paragraphs (2 Total) 1 on Historical Mass Extinction 1 on the current Sixth Mass Extinction Total30Paragraphs have topic sentence and have been proofread forgrammar and sense.Paragraphs have accurate facts.Paragraphs include all required details.Paragraphs incorporate explanations or summaries in your ownwords.35 points

1. How can humans be causing a possible mass extinction? What human activities are causing extinctions? Explain. 2. What organisms are on the losing end of this hypothesized mass extinction? 3. Even if humans are not the cause of a mass extinction, do you think another mass extinction is possible? Probable? Why or why not? Defend your answer .

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