Question 20
Refer to the illustration below.
June walked along a slow-flowing river that is shown above. She noticed that
the water in certain parts of the river was filled with a green substance. She
collected samples of the water at locations X and Y over a period of five weeks
and plotted the results on the graph shown below.
What caused the water at Y to turn green?
A. Fertilizer from the farm
B. Green paint discharged by the factory
C. Green detergent discharged from the houses
D. Green paint discharged from the school
Appearance of water
Dark green
Green
Light green
Clear
Sample Y
Sample X
Week
1
2
3
4
5
X
Y
of water
flow
Direction
Legend:
Farm
House
School
Factory
June walked along a slow-flowing river that is shown above. She noticed that
the water in certain parts of the river was filled with a green substance. She
collected samples of the water at locations X and Y over a period of five weeks
and plotted the results on the graph shown below.
What caused the water at Y to turn green?
A. Fertilizer from the farm
B. Green paint discharged by the factory
C. Green detergent discharged from the houses
D. Green paint discharged from the school
Appearance of water
Dark green
Green
Light green
Clear
Sample Y
Sample X
Week
1
2
3
4
5
X
Y
of water
flow
Direction
Legend:
Farm
House
School
Factory