Part 1 Sorting Earth Materials Focus Question How big are rocks Rock Mixture Each group One cupful of the mixture Two paper plates Two sheets of newspaper Two hand lenses Two metric rulers ID: 534358
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Slide1
Investigation 2: Weathering and Erosion
Part 1: Sorting Earth MaterialsSlide2
Focus Question
How big are rocks?Slide3
Rock Mixture
Each group:
One cupful of the mixture
Two paper plates
Two sheets of newspaper
Two hand lenses
Two metric rulersSlide4
Analyze
Divide the rock mixture between the two paper plates
Each pair examines and records observations in journal
Put newspaper under the paper plates for easy clean upSlide5
Sorting
How did you sort your material?Slide6
Wentworth Scale of Rock Particle Size
Boulder – Above 256 millimeters (mm)
Cobble – 64-256 mm
Pebble – 4-64 mm
Gravel – 2-4 mm
Very coarse sand – 1-2 mm
Coarse sand – 0.5-1 mm
Medium sand – 0.25-0.5 mm
Fine sand – 0.125-.025 mm
Very fine sand – 0.062-0.125 mm
Silt – 0.004-0.062 mm
Clay –Less than .004 mmSlide7
Measuring Time!
Each pair needs a ruler with millimeters
You have time to measure all four piles
Determine which category each falls into based on the scale
Add this information to your notebooksSlide8Slide9
Rock Sizes in Nature
Today I handed you a cup of rocks that are all different sizes. Do rocks always appear in nature mixed up by size?
Where in nature can you find sand?
How does sand get separated from other sizes of earth materials in nature?
What would cause sand to become separated from other sizes of materials in a desert?
Would wind separate materials in your mixture?
Which size of materials would be moved easily by wind?Slide10
Sorting
The process of separating earth materials by sizeSlide11
Wind Test
GENTLY
blow on the mixture
Which particles move easiest?Slide12
Small-Particle Categories
Press finger on the dust and rub between fingers
If gritty (rough), silt particles
If smooth, clay particlesSlide13
Rock Categories
How are each of the particles in the earth-materials mixture alike?
How are the particles in the mixture different?
How are the sand-sized particles like the gravel pieces?Slide14
Wrap-Up
Focus Question: How big are rocks?
Record vocabulary in IndexSlide15
Homework
Visit your backyard, local park, the school, or somewhere else
Inventory the types of rocks
you discover