How people change the environment, and ways to reduce the harm

Grade 6 Science Worksheet - Challenge Me

Circle the best answer.

1. Read this first

   Four boxes in a row

   Cause, effect, fix, then the fix's cost.

2. 1.

   A town wants less runoff from a big parking lot. Which plan and trade-off fit, by Esme's reading (EPA)?

   • Cutting nearby trees, which saves space
   • Rain gardens around the lot, which take space and care
   • Rain gardens, which have no costs to weigh
   • More pavement, which costs nothing to keep up
3. 2.

   A power plant must cut its sulfur pollution. Which plan and trade-off fit, by Jun's reading (EPA)?

   • A taller smokestack, which removes the sulfur
   • A wet scrubber, which removes most of it but needs water treatment
   • Burning more coal, which spreads the smoke thinner
   • A wet scrubber, which removes 100% of it and needs no water or treatment at the plant
4. 3.

   A lake wants to keep zebra mussels out. Which plan and trade-off fit, by Kira's reading (USGS)?

   • Adding more mussels, which crowds out new ones
   • Boat checks, which take time and workers
   • Bringing in boats from mussel lakes, which saves time
   • Boat checks, which cost nothing

5. Where rain goes (Data: USGS)

   Ground	Runs off	Soaks in
   Forest or meadow	10%	50%
   Mostly paved (75–100%)	55%	15%

6. 4.

   Example data: 2,000 gallons of rain fall on a parking lot. Using the USGS table, how much more runs off than on a meadow, by Milo's math?

   • About 4,500 gallons more
   • About 1,100 gallons more
   • About 200 gallons more
   • About 900 gallons more

7. Use the table

   U.S. fish stocks, end of 2024 (Data: NOAA)

   Measure	Number of stocks
   On the overfished list (too few fish left)	42
   Rebuilt since 2000	51

8. 5.

   Using the NOAA table, how many more stocks were rebuilt than are now on the overfished list, by Noah's math?

   • 9 more
   • 42 more
   • 93 more
   • 51 more
9. 6.

   A classmate says invasive species help a lake because they add more life. Which reply fits USGS, by Pia's reading?

   • Correct; zebra mussels clean out the pipes of power plants and water plants
   • No; zebra mussels crowd onto native clams and clog water pipes
   • Correct; any new species helps a lake
   • No; zebra mussels cannot live in the Great Lakes

10. Use the table

    U.S. changes, 1970 to 2025 (Data: EPA)

    Measure	Change
    Six main air pollutants	down 78%
    Population	up 67%
    Miles driven	up 197%
    Energy use	up 46%

11. 7.

    A student says U.S. air keeps getting dirtier because the population keeps growing. Which reply fits EPA, by Ren's reading?

    • No; the population shrank by 67%
    • No; the six main pollutants fell 78% while the population grew 67%
    • Correct; the pollutants rose 78% as the population grew
    • Correct; more people must mean dirtier air

12. Rain-garden test results (example data)

    Design	Runoff cut	Cost
    A: small garden	30%	$200
    B: large garden	60%	$500

    Note: The town needs at least a 50% cut and has $600.

13. 8.

    Using the test results, which design meets the town's goal and budget, by Zee's reading?

    • Neither design meets the goal
    • Design A, which cuts 30% for $200
    • Design A, since the cheaper one is the better one
    • Design B, which cuts 60% for $500
14. 9.

    Using the test results, the town's budget drops to $300. What trade-off does it face, by Ari's reading?

    • Both designs now cost nothing
    • It can still afford Design B
    • Design A now cuts 60% of the runoff
    • It can afford only Design A, which cuts less runoff
15. 10.

    Cause, effect, fix, then the fix's cost. Which summary of the chain model fits, by Bo's reading?

    • A human cause leads to an effect, and a fix can help but has a cost
    • Any fix solves the problem with no cost
    • A fix works well when it adds to the cause
    • A human cause has no effect on land, water or air, so fixes and their costs are not needed