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-Made observations about the grain size.
-Four components of soil:
Humus
Sand
Gravel
Clay
-Added different components to water and observed how they reacted in the water.

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humus- some of it sunk and the rest stayed at the top.

clay- when it went in water it turned into chunks. i also noticed   that the water absorbed some
clay.

gravel- in the water it sinks. it also holds the water above it.

sand- when you put the sand in the water it absorbs

Rosie , chloe

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How can you explain what happened? What made it happen? (2)

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How can you explain what happened? What made it happen? (2)

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Bella/Ridwan/Julie.
-The gravel sank while the hummus floated because the gravel had more weight and the hummus is more light
-and there was air bubbles that came from the components of soil because the components most likely has air inside to absorb the water and when it is in water the air escapes in the form of the bubbles
-

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How dos that answer the question, Ẅhat caused the Oso landslide?¨ (3)

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How dos that answer the question, Ẅhat caused the Oso landslide?¨ (3)

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Because water could overflow and weaken the soil and since the mud is weakened the mud falls down caused by gravity.

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Created a cliff with the soil components
-Sprayed water bottle to act like rain on land.
-Looked at bucket to see the collected "runoff" or the lack of "runoff" collected in the bucket.
-Looked at how much rain occured in the area before and after the landslide in Oso.
-Estimated that there was about 40 inches of rain during the 3 months before the landslide.

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-I learned that when the water and the clay there were open
cracks-Tresean
-I learned that when you spray water on the soil the soil will
suck the water in and make it fall apart and wet-Najma
-I learned that when the water got sucked in and you left it dry
lar it becomes hard-Tresean
-I learned that when you put the water

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How can you explain what happened? What made it happen? (5)

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How can you explain what happened? What made it happen? (5)

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Abby,Alivia/ We built the cliff at a shallow angle and it didn't slide down because we sprayed the water bottle at an angle that it packed it down. Jose/ adding to Abby and Alivia the water spread ed into the soil and made it darker and more stickier and hard while it goes to the bottom of the project. done!

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How does this help us answer, "What caused the Oso Landslide?" (6)

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How does this help us answer, "What caused the Oso Landslide?" (6)

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dom/I think what happen to the Oso landslide is it could muddy over time and it was  unbalance so I think that how the Oso landslide happen/ Ibrahim it happened by erosion because the clay cant hold all the water and all the rocks fell and bcasuse everything to fall with it./john le       i i think that the  oso landslide
happen  is like ibrahim said  it could not hold the water a loseing the dirt  and rock mostly the dirt and make  the rock fall.

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-Poured various components of soil in 30ml of water. Observed what component absorbed the most waterObserved what components water moved more easily through
Read about erosion.
-Gravel let the most water through.
-Humus and Clay had the most runoff

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we saw that when we put in the water it reached 500mL then after a little while the water got absorbed and there was less water in the tube

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How can you explain what happened? What made it happen? (8)

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How can you explain what happened? What made it happen? (8)

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Amani/chawn -first we put the gravel in the tube -then we put 30ml of water in the tube -then we saw the gravel sinking then when we poured the gravel water out  -and the gravel had 36ml water poured out and we figured out that clay had that clay had the most water poured
out.    i think the water that we poured 340

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How does this help us answer, "What caused the Oso Landslide?" (9)

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How does this help us answer, "What caused the Oso Landslide?" (9)

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-BRI-i was think it was caused by the clay layer made everthing fall to caus the landslide.

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packed it down. Jose/ adding to Abby and Alivia the water spread ed into the soil and made it darker and more stickier and hard while it goes to the bottom of the project. done!