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Classroom activity Grade 4 English Language Arts

Stage Card Shuffle: A Grade 4 Wastewater Sequencing Activity

A grade 4 team activity where students read five shuffled description cards from a fictional wastewater plant and use text details to put the treatment stages in order.

Objectives

  1. Students will read five stage description cards and place them in the correct treatment order using text evidence.
  2. Students will explain, using details from the cards, why one stage must happen before another.

Vocabulary

Aeration
Aeration means mixing air into water. At a wastewater plant, blowers bubble huge amounts of air through tanks so the helpful microbes have the oxygen they need to eat the waste.
Disinfection
Disinfection is the step that kills or disables germs in water so it is safe to drink. Water plants usually disinfect with chlorine, ultraviolet light, or ozone.

Also: screening, settling, sequence

Teacher overview

Briarcliff Wastewater Plant, a fictional plant used for this activity, cleans used water from homes before it can safely return to a river. This is a team activity for groups of three or four: each team receives one shuffled set of five stage description cards and races, without any teacher-given order, to read the details on every card and arrange them correctly using only the text evidence each card provides. The card format teaches the concept directly, since the only way to solve the sequence is to notice which cards describe something entering that a previous card described as leaving, exactly the kind of detail-based inference CCSS RI.4.1 asks fourth graders to practice.

Activity Directions

  1. Before class, print and cut five stage cards for each team. Screening: "Water first passes through a metal screen that catches large solid objects, such as wipes and trash, before anything else happens to it." Settling: "Water sits still in a large tank long enough for heavier bits that passed through the screen to sink to the bottom." Aeration: "Air is bubbled through the water so that helpful bacteria can multiply and break down waste that settling could not remove." Disinfection: "A small amount of chlorine or another disinfectant is added to kill remaining germs before the water leaves the plant." Release: "The cleaned water is released into the river, now safe enough to rejoin the water cycle."
  2. Divide the class into teams of three or four. Give each team one shuffled set of five cards, face down, in an envelope.
  3. On "go," teams open their envelope and read all five cards together. Each card contains a clue about what the water looked like before and after that stage, the evidence teams need to sequence them correctly.
  4. Teams arrange their five cards in a row in what they believe is the correct treatment order and raise their hands when finished.
  5. Once every team has finished (or after an 8-minute timer, whichever comes first), the teacher reveals the posted answer key: Screening, Settling, Aeration, Disinfection, Release.
  6. Each team checks its own row against the key and counts how many cards are already in the correct position.
  7. Teams that placed all five cards correctly explain to the class, using a detail from one card, why that stage could not have come earlier or later in the sequence.
  8. The activity ends once every team has either explained a correct sequence or corrected its row using the posted key and can state one reason for the fix.

From Water for Schools (waterforschools.org). This material is in the public domain (CC0) and may be copied, edited, and shared freely.

Answer Key
  1. Answer: The correct order is Screening, Settling, Aeration, Disinfection, Release. Screening must come first because it removes large solid objects before any other process; Settling depends on objects already being screened out; Aeration builds on a settled tank; Disinfection treats water that has already had solids and much of the waste removed; Release happens only after the water is disinfected.
  2. Debrief question: "Why can't Disinfection happen before Screening?" Answer: Disinfectant is meant to kill remaining germs in water that has already had large solids and settled waste removed; adding it to water still full of trash and heavy solids would waste the chemical and leave germs protected inside that debris.
  3. Debrief question: "What detail on the Aeration card tells you it comes after Settling?" Answer: The Aeration card states that bacteria break down waste "that settling could not remove," which only makes sense if settling has already happened.

Differentiation

Support

Reduce each team's set to four cards by removing Aeration and pre-explaining it as a bonus fifth stage once the four-card order is correct, and allow teams to keep the cards face up while reading instead of testing memory of the details.

Extension

Ask fast-finishing teams to write a sixth card for a stage not shown, such as a final water-quality check before release, and explain using their own wording exactly where in the five-stage sequence their new card belongs.

ELL supports

Add a simple icon to each card (a screen with dots for Screening, a tank with settled dots for Settling, bubbles for Aeration, a plus sign in a drop for Disinfection, an arrow into a wavy line for Release) so students can use the pictures alongside the text to support their sequencing decisions.