The Earth's mantle stretches to a depth of 2,890 km, making it the planet's thickest layer. [7] The mantle is subdivided into upper and lower mantles by a transition zone. [9] The Dâ3 (D-double-prime) layer is the lowest section of the mantle at the core-mantle boundary. [10] The pressure at the mantle's bottom is 140 GPa (1.4 Matm). [11] The mantle is made up of silicate rocks that are richer in iron and magnesium than the crust. [12] Although solid, the highly heated silicate material of the mantle may flow over very long timeframes. [13] The movement of the tectonic plates in the crust is propelled by mantle convection. The source of heat driving this motion is primordial heat left over from the planet's birth, which is regenerated by radioactive decay of uranium, thorium, and potassium in Earth's crust and mantle. [14]
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*They will almost certainly mention an egg, but they will describe how the egg will function as a model of the Earth.
Split the egg, display the Layers of an Egg/Layers of the Planet transparency above, notify the students that we will be examining the layers of the earth today, and then explain:
After all of that, you may be persuaded that play-doh and paper are much superior materials for creating rudimentary earth/atmosphere models, and I would suggest that you are probably correct. However, if you like this concept and have any queries, please send me a message or leave a comment!
