Sid gathered some stuff from a stream, Sid gathered some stuff from a stream, in a bucket. He separated out the in a bucket. He separated out the particles and measured each pile.particles and measured each pile.

(Copy down this chart)(Copy down this chart)

Substance Mass Volume DensityPebbles 84.7 g 31.5 mlClay Silt 21.0 g 13.13

ccWood Chips 62.1 g 68.2

cm3

Sand 49.7 g 25.89 ml

Water 61.1 g 60.9 mlAir 1.2 g 1200

mlLarge rocks 85.9 g 32.3 cc

Sid forgot his calculator. Make the Sid forgot his calculator. Make the density calculations for him.density calculations for him.

(round your answer to the accuracy of the given (round your answer to the accuracy of the given numbers)numbers)

Substance Mass Volume DensityPebbles 84.7 g 31.5 mlClay Silt 21.0 g 13.13

ccWood Chips 62.1 g 68.2

cm3

Sand 49.7 g 25.89 ml

Water 61.1 g 60.9 mlAir 1.2 g 1200

mlLg rocks 85.9 g 32.3 cc

1 point for each correct answer. 3 1 point for each correct answer. 3 points for creating the chart.points for creating the chart.

Substance Mass Volume DensityPebbles 84.7 g 31.5 ml 2.7 g/mlClay Silt 21.0 g 13.13 cc 1.60 g/ccWood Chips 62.1 g 68.2 cm3 0.91

g/cm3Sand 49.7 g 25.89 ml 1.92 g/mlWater 61.1 g 60.9 ml 1.0 g/mlAir 1.2 g 1200 ml 0.001

g/mlLg rocks 85.9 g 32.3 cc 2.7 g/cc

Sid then mixed all of the stuff back Sid then mixed all of the stuff back together and put it in a glass jar.together and put it in a glass jar.

Make a prediction.

Draw what you think Sid’s jar will look like if he doesn’t touch it for 10 minutes.

Evidence:Evidence:

Play with the tubes for a minute. Gather evidence…

Which particles settle to the bottom first?

Which particles are always on top?

What is at the very top of the tube?

Draw the evidence in your notebook on the left side.

Evidence:Evidence:

Now, write the densities next to each layer.

Draw the evidence in your notebook.

Inference:Inference:

How does your drawing of the tube compare to your drawing of Sid’s river stuff?

What inference can you make about density?

Make an inference on the right side.

Evidence:Evidence:

Examine the particle sizes of sand, silt, and pebbles.

Label your jar as biggest, medium, smallest

Inference:Inference:

What inference can you make about particle size?

Which would fall to the bottom first, large rocks or small pebbles? (Assuming that they were the same density.)

Make an inference on the right side.

Big Idea #1Big Idea #1

Particles sort according to density – most dense at the bottom.

Big Idea #2Big Idea #2

Particles sort according to particle size – biggest at the bottom.

How does this apply to the whole How does this apply to the whole earth?earth?