Identifying the Reddish-Brown Substance (continued)
Part 3: Writing to the People of Westfield
Dr. Yung wants you to explain what the reddish-brown substance is to the people of Westfield.
As you write your argument, remember to:
• state your claim about the identity of the reddish brown substance.
use evidence from both your observations and the atomic-scale models to support your
claim.
• include the vocabulary words listed below in your argument.
Chapter 1 Question: What is the reddish brown substance in the water?
Claim 1: The reddish brown substance is the same as the substance that makes up the
pipes.
Claim 2: The reddish-brown substance is the same substance as the fertilizer.
Claim 3: The reddish brown substance is not the same as either the fertilizer or the
substance that makes up the pipes.