Define the following Vocabulary for Extra Credit: 1. Asthenosphere

2. Lithosphere

3. Mantle

4. Compositional Layers

5. Mechanical Layers

6. Continental Crust

7. Oceanic Crust

8.inner Core

9 Outer Core

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Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.