Earth Science - Mrs. Kepner

3D SCALE MODEL OF THE EARTH

Directions: Follow all steps to receive 40 points towards you Project Grade. Your group is graded as a whole.

Getting Your Sphere: Joanne’s Fabric, Walmart, & Michael’s have 8 and 6 inch Styrofoam spheres.

Finding Your Scale Calculations 10 points: Complete worksheet for both 8 and 6 inch sphere. The ‘X’ for each layer represents the thickness of each layer, not its radii. If you are working with a different size model, please see me to get an adjusted scale worksheet. Everyone does this!

Cutting & Using Math Page to Trace Layers 10 points: Have your parents help you. Go to youtube.com and search for Ben Holt Mrs. Kepner or type in the following for directions: http://www.youtube.com/watch?v=e1V8iyyLY5U & http://www.youtube.com/watch?v=al2x-rKPkkw&feature=related.

Painting Layers and Labeling 10 points: Each layer of the Earth should be:

- painted, labeled with the name of the layer, and

- indicate its size in centimeters. The size on your model should be the same size you found in your calculations on the math page.

- Paint outside to look something like the Earth (Green land/blue water)

Create a method for supporting model 10 points: Let your creativity reign. Somewhere on your stand should be a title, your group members, and table including the layers of the earth, their actual size, and their size on your model.

Due dates:

Math Page Completed – 8/31

Sphere cut, Layer’s measured & marked; design for labels & stand: 9/9

Completed Model (painted & stand made – put together in class – 10 minutes): 9/23

Jobs:

Math Page: Everyone .

Sphere Cutting, layers measured & marked: _____________________________

Paint Layers & make labels: ____________________________

Stand: ________________________________

MATH PAGE

(COMPLETE EITHER 8 & 6 INCH OR 10 & 4 INCH TABLES)

Layers of the Earth	Actual Value	8 inch foam sphere (actually 19.8cm)Scale Value (1:62,500,000)	6 inch foam sphere (actually 14.5cm)Scale Value (1:83,333,333)
Radius of Earth	6410 km	9.9 cm ≈ 9 cm 9 mm	7.25 cm ≈ 7 cm 3 mm
Thickness of crust (average)	50 km	50 km = X cm 6410 km 9.9 cm cm ≈ X	50 km = X cm 6410 km 7.3 cm cm ≈ X
Thickness of mantle	2900 km	2900 km = X cm 6410 km 9.9 cm cm ≈ X	2900 km = X cm 6410 km 7.3 cm cm ≈ X
Thickness of outer core	2260 km	2260 km = X cm 6410 km 9.9 cm cm ≈ X	2260 km = X cm 6410 km 7.3 cm cm ≈X
Radius of inner core	1200 km	1200 km = X cm 6410 km 9.9 cm 11,880 cm/km = 6410X cm/km 6410 km 6410 km 1.9 cm ≈ X	1200 km = X cm 6410 km 7.3 cm 8760 cm/km = 6410X cm/km 6410 km 6410 km 1 cm 3.6 mm or 1.4cm ≈ X
Layers of the Earth	Actual Value	10 inch foam sphere (actually 24.5 cm)Scale Value	4 inch foam sphere (actually 10 cm)Scale Value
Radius of Earth	6410 km	12.25 cm	5 cm
Thickness of crust (average)	50 km	50 km = X cm 6410 km 12.25 cm cm ≈ X	50 km = X cm 6410 km 5 cm cm = X
Thickness of mantle	2900 km	2900 km = X cm 6410 km 12.25 cm cm ≈ X	2900 km = X cm 6410 km 5 cm cm ≈ X
Thickness of outer core	2260 km	2260 km = X cm 6410 km 12.25 cm cm ≈ X	2260 km = X cm 6410 km 5 cm cm ≈X
Radius of inner core	1200 km	1200 km = X cm 6410 km 12.25 cm 14,700 cm/km = 6410X cm/km 6410 km 6410 km 2.3 cm ≈ X	1200 km = X cm 6410 km 5 cm 6000 cm/km = 6410X cm/km 6410 km 6410 km 0.9 cm ≈ X

Rubric for 3D Model of Earth
Jobs	1-2 points	3-5 points	6-7 points	8-9 points	10 points
Math Job	Work messy or late, incorrect, doesn’t show work	Work might be messy or late; work correct; doesn’t show any work	Work might be messy or late; work correct; doesn’t show some work	Work might be messy or late; all work correct; work shown	Turned in on time; math correct; work showed the way Mrs. K demonstrated; neat
Cutting & Tracing Layers	Work is late, messy, and layers are the wrong size	Work might be late, or cutting is messy; Layers off by a centimeter or more	Work might be late or cutting might be a little jagged; size of the layers a little off	Work might be late; cutting might be a little jagged; layers correct size	Cutting neat and even; Turned in on time; Layers are the correct size
Painting & Labels	Messy; layers hard to distinguish; lack of effort; labels in wrong place or messy & missing size	Can have three or four of the following errors: Labels either messy, misplaced, and/or missing model size; painting a little messing or difficult to distinguish between layers; lack of effort	Can have two or three of the following errors: Labels either messy, misplaced, and/or missing model size; painting a little messing or difficult to distinguish between layers; some lack of effort	Painting fairly neat; labels might be missing model size; labels in the right place	Labels for each layer neat & have model size; labels on correct layer; painting neat: doesn’t go into other layers; boundary between layers clear
Stand & Data Table	Messy; unstable; missing data table	Can have two of the following errors: a unstable; messy table missing three or four item; some items incorrect on table	Can have two of the following errors: a unstable; table missing one or two item; one or two items incorrect on table	Can have one of the following errors: a little unstable; table missing one item	Supports model well; looks neat, can see effort was put into it; has neat table with layer, actual size, scale size, title, & group names