1. Sorting it all out

2. Sorting Two main factors affect how materials in the earth are sorted: –Density –Particle size

3. Sorting - Density Under normal circumstances, more dense materials will end up on bottom, and less dense materials will end up on top.

4. Sorting - Density Sorting according to density can be seen in the earth’s layers

5. Sorting - Density Some salad dressings sort according to density.

6. Sorting – Particle size Even in items that sort according to density, particle size will affect the overall sorting because smaller particles might sift down through the gaps in bigger particles.

7. Sorting – Particle size If there is a disturbance (Like on the seashore, in a stream, or anywhere there is moving water),particle size is the main factor that determine how things will sort out.

8. Sorting – Particle size In a river, bigger, heavier rocks will sort out sooner, even though they may be slightly less dense, because the current can’t carry them as well.

9. Sorting – Particle size In slower moving parts of the river, smaller particles like sand and silt will settle out.

10. Sorting – Particle size How would you expect rocks to settle out on the beach?

11. Sorting – Particle size How might the waves be different at these two beaches?

12. Sorting – Density and size Sorting according to density and particle size can also be seen in road cuts…

13. Sorting – Density and size …or mining

14. Sorting - Uses We use sorting in panning for gold Do you think this method of sorting is more affected by particle size or density?

15. Sorting - Uses Why do you put salad dressing on your salad and not salad on your salad dressing? Do you think this method of sorting is more affected by particle size or density?

16. Sorting - Uses Why do you put whipped cream on your pie instead of pie on your whipped cream? –Is this an example of sorting by density or by size?

17. Sorting - Uses Why do you add salt to popcorn instead of popcorn to salt? –Is this an example of sorting by density or by size?

18. Sorting - Uses If you throw a pencil into your backpack, where does it end up? –Is this an example of sorting by density or by size?

19. Sorting – Inferring Earth’s history We can use our knowledge about how things are sorted to help us make inferences about events that occurred in Earth’s history. Changes to Utah

20. Lake Bonneville Sorting Lake Bonneville Flood boulder size