A slideshow about the Earth

1. Forces Shaping Earth-Earth’s Interior Chapter 2

2. Chapter Challenge 1 Sydney 9/2/10 #4 Construction Foreperson

3. Earth’s Layers Based on evidence from earthquake waves and exposed rocks, scientists have been able to produce a model of Earth’s interior. Earth’s interior has at least four distinct layers-the inner core, the outer core, the mantle, and the crust. Earth is similar to a peach in some ways. It has a thin skin, a thick juicy middle, and a pit. Density, temperature, and pressure are lowest in the crust and greatest in the core

4. Inner Core The innermost layer of the Earth is the solid inner core. The core is dense and mostly composed of solid iron. When seismic waves reach this layer they speed up, indicating that it is solid. The inner core is the hottest part of the Earth at 5,000 C. The core is under tremendous pressure. Pressure increases because more material is pushing toward Earth’s center as a result of gravity.

5. Inner Core

6. Outer Core The outer core lies above the inner core It is thought to be composed mostly of molten metal The outer core stops on kinds of seismic ways and slows down another because it is liquid.

7. Outer Core Outer Core

8. Mantle The mantle is above the outer core It is the largest layer in the Earth’s interior, it makes up about 67% percent. Even though the mantle is solid, it flows slowly, similar to putty. The mantle has two parts: the asthenosphere-the lower mantle, and the lithosphere- the upper mantle The lithosphere is composed of crust and the asthenosphere is composed of a plastic-like layer upon which the plates of the lithosphere float and move

9. Mantle

10. Crust The crust is the outermost layer It is the thinnest layer of the Earth The thickness varies; the crust under an ocean is thinner than the crust under the continents All Earth’s features are part of the crust

11. Crust

12. Distribution of Earth’s Mass