model tested variable uncontrolled variable Brainstorm Work in pairs to brainstorm a list of factors that could determine whether an earth material such as rock or soil would be eroded more or less ID: 538955
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controlled variable
model
tested variable
uncontrolled variableSlide4
Brainstorm
Work in pairs to brainstorm a list of factors that could determine whether an earth material, such as rock or soil, would be eroded more or less.
Record
your answers in your notebook.Slide5
Read the introduction and look for key ideasSlide6
Do all kinds of earth materials erode in the same way?Slide7
Vocabulary review
Variables
– factors that could all have any possible number of possible values depending on the situation.
Controlled variables
– variables that were either held constant or whose impact was removed in order to analyze the relationship between other variables without interference.
Tested variable
– the variable that was changed in some systematic way in order to determine its effect.
Uncontrolled variables
– variables that are neither controlled or tested.Slide8
Complete the procedure and record your dataSlide9
Analysis question 1
How are the models you used:
like a real landform?
not like a real landform?Slide10
Analysis question 2
In this investigation, which variables were:
kept the same?
tested?
not kept the same?Slide11
Analysis question 3
In your model, which earth material showed the least erosion? Using evidence from this investigation, explain why this material may have eroded less than the other two.Slide12
Analysis question 4
The hills made in this activity model the three kinds of earth materials listed below. Copy the list and then, next to each description, write whether it describes Earth Material A, B, or C. For each one, give the evidence from this activity that helped you decide your choice.
loose soil
sticky soil
loose soil and vegetationSlide13
Analysis question 5
Would you expect more erosion to be observed at Green Hill or
Seaside Cliff
?Slide14
Is it more
likely that
the Delta Marsh is made up of sediments
from the
loose soil on Green Hill or the sticky soil
from Seaside
Cliff?
Share your thoughts with the class.Slide15
Do all kinds of earth materials erode in the same way?Slide16
Key vocabulary definitions
Controlled
variables
- variables that were either held constant or whose impact was removed in order to analyze the relationship between other variables without interference.
Model
- Any representation of a system, or its components, to help one study and understand how it works.Slide17
Key vocabulary definitions
Tested
variable
- the variable that was changed in some systematic way in order to determine its effect.
Uncontrolled
variables
- variables that are neither controlled or tested.