L.O: SWBAT EXPLAIN HOW PARTICLES SETTLE in STILL WATER .

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Presentation transcript:

L.O: SWBAT EXPLAIN HOW PARTICLES SETTLE in STILL WATER . Do now sheet

WHAT DO YOU NOTICE?

Settling: when sediment particles sink (are deposited) in still water because of gravity. What is happening to these particles in water? The particles are settling

Explain these 3 images. WHY do they look this way?

If placed in still water, which sediment particle would settle first If placed in still water, which sediment particle would settle first? Which would settle last? Why?

3 factors affect settling rate: 3 factors affect how fast sediment sinks when in water Particle size particle shape particle density

Which size particle will settle fastest in water? Slowest? Why? If they are made of the same uniform material, Large diameter particles settle faster , Small particles settle slower 1.Particle size: As particle size increases, settling time decreases. Which size particle will settle fastest in water? Slowest? Why? boulder cobble pebble sand silt

WHY?

WHY?

Vertical sorting: if made of the same density material, in still water, the largest particles settle first. The smallest settle last. Small sized sediment Medium sized sediment Largest sediment

WHY?

Sometimes vertical sorting by PARTICLE SIZE can happen over and over as new sediment is deposited WHY?

2.Particle shape: Round & smooth particle These particles are made of the same substance. Which will shape settle fastest? Slowest? Why? Round & smooth particle Flat, angular & rough particle

As particle shape becomes round, settling rate gets faster. If they are made of the same uniform material, Round & smooth particles settle faster than flat, angular & irregular shaped particles. Settles slowest Settles fastest

WHY?

WHY?

Which density particle will settle fastest in water? Slowest? Why? If they are the same size & shape, high density particles settle faster than lower density particles. 3.Particle density: Which density particle will settle fastest in water? Slowest? Why? 3.2 g/cm3 7.6 g/cm3 5.8 g/cm3

As density increases settling time decreases.

WHY?

The largest, roundest, & densest particles settle first.

Independent work: complete regents questions 1-10 Homework: complete regents questions 11-18

L.O: STUDENTS WILL COMPLETE THEIR DEPOSITION LAB PARTICLE diameters (SIZES): 3.O mm (millimeters) 4.0 mm 5.0 mm Densities: Glass beads: 2.47 g/cm3 Steel beads: 8.05 g/cm3