Was our pond healthy? How do you know? Agenda for Thursday Sept 29 th 1.Quiz 2.Cholera stuff Learning Targets 1.Understand the need for evidence 2.Use mapping skills to plot data 3.Use plotted data to infer a possible cause for the disease

London 170 years ago A new and terrible disease was killing hundreds of people Several outbreaks Ideas about how it spread but no one attempted to prove the cause

Cholera Problem in India and the far east since 400 B.C. Quickly spread because of travel and trade – Cause of over 21,000 deaths 19 th century cholera caused widespread death in the U.S. – Poor sanitation & lack of understanding – Come and go – Not everyone got it Still a problem today in India and other places

What was a main reason cholera spread? Agenda for Friday Sept 30 th 1.Finish Cholera 2.Movie Learning Targets 1.Understand the need for evidence 2.Use plotted data to infer a possible cause for the disease

Vocab Hypothesis – educated guess based on observations Theory – based on extensive evidence and research Infer (inference) – reach conclusion based on the evidence you have

What is a theory? Agenda for Monday Oct 3 rd 1.Finish letter 2.How to get rid of contaminants in water

How is chlorine both good and bad? Agenda for Tuesday Oct 4 th 1. Chlorine lab

If chlorine can be dangerous, how can we use it to kill organisms in our water? Agenda for Tuesday Oct 4 th 1. Chlorination Lab

What are some hazards with using chlorine? Agenda for Wednesday Oct 5 th 1.Finish Chlorine stuff 2.pH

Common Values of Chlorine Pool water has between 1 and 3 ppm chlorine Tap water has between.2 and.5 ppm Minimum level of chlorine must be.2 ppm to kill organisms