Monday, February 23, 2009

Hi our names are LaDeanna, Brenna, Cole, and Dakotah. we were assigned to do a investigation on a sample core. this is our investigation!

Question: What is the difference in sediment size at 10cm compared to 90cm?

Procedure: 1. First we will take a sample from the core at 10cm. 2. Then we will create a slide for the 10cm sample. 3. Next we will take a sample fromt he core at 90cm. 4. Then we will create a slide for the 90cm. sample. 5. After, we will compare the two sediment samples under a microscope. 6. Finally, we will record our data in our notebook.

Materials: 1 spatula, 2 toothpicks, 2 slides, 2 coverslides, 1 microscopes.

Variable changed: 10 cm to 90 cm

Variable Measured: Sediment size

Controlls: same magnification, same size samples, same depths in core.


  • Sediments in 10cm are more clear than the 90 cm sediments.
  • Sediments at 90 cm are larger than sediments at 10 cm.
  • loosly formed ovals at the 10 cm & 90 cm measurements
  • sediments at 10cm are 2 times larger than the size of the pointer
  • sediments at the 90cm are 4 times larger than the size of the pointer


Claim-the 90cm sample we took has larger sediment than the sediments at 10cm

Evidence- the sediments in the 90cm sample were about 4 times the size of the pointer. The sediments in the 1ocm sample were only 2 times the size of the pointer.

Reasoning- We think that climate could determine the size of the sediments. We think so because when it's wet, sediments break off each other into smaller pieces, but when it's drier, they stay in one large sediment clump. So when it's dry, your going to have the larger clumps blow in because the smaller ones won't wash in due to lack of rain.

Futher Questions:

1. would the sediments sizes change, if we took our samples by the highway versus by a forest?

2. If the core was taken during the wetter season, would the sediments at 90cm have been smaller?

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