November 2012 Breaking a complex problem into parts System Closed Open a system that does not allow matter to pass through its boundaries but may allow energy to pass through its boundaries ID: 502696
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Slide1
Origin and Structure of the Earth
November 2012Slide2
Breaking a complex problem into parts:
System
Closed Open
a system that does not allow matter to pass through its boundaries, but may allow energy to pass through its boundaries
a system that allows both matter and energy to pass through its boundaries
any part of the universe that can be isolated for the purpose of observing and measuring changeSlide3
Structure of the Earth
How do scientists study this?
seismic waves
(caused by earthquakes or giant man-made explosions)
As waves pass through the Earth. They encounter different materials and change in important ways, becoming longer, shorter, faster, or slower.
Magnetic fieldSlide4
Structure of the Earth
The Core
solid inner core made of iron (about 800 miles thick), liquid outer core (1370 mile thick) composed of iron-nickel alloy, oxygen.Slide5
Structure of the Earth
The Core
Magnetic Field: From the liquid outer core: seethes and roils like water in a pan on a hot stove. Slide6
Structure of the Earth
The Mantle
extremely hot and high pressure solid rock (iron-magnesium silicate, oxides) that accounts for about 80% of Earth’s volume, about 1750 miles thick.Slide7
Structure of the Earth
The Crust
outermost compositional layer of the solid Earth, made of oxygen, silicon, and aluminum, 0-22 miles thick
1.Continental: thick, older, and buoyant, rocks like granite
2. Oceanic: thin, younger, and dense, rocks like basalt