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**1.1 Earth's Crust in Motion**
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Vocabulary

 * Geologists:** scientists who study the forces that make and shape the earth
 * Geology**: the study of planet Earth
 * constructive forces**: forces that build up landmasses like mountains
 * destructive forces**: forces that slowly wear away mountains and surface such as what an ocean does
 * continents**: seven large landmasses on earth
 * seismic waves**: waves that move through the Earth's interior
 * pressure**: force pushing on a surface or area
 * crust**: layer of rock that makes up the Earth's outer skin
 * basalt**: dark, dense rock that forms the oceanic crust
 * granite**: rock with larger crystals that is less dense than basalt and makes up the continental crust
 * mantle**: layer of hot rock below the crust
 * lithosphere**: means "**stone**" and is the mantle and crust together
 * asthenosphere**: means "**weak**" soft rock material that can flow slowly
 * outer core**: layer of **molten** metal that surrounds the inner core
 * inner core**: dense ball of **solid** metal

Science of Geology

 * studying surface changes
 * surface always changing
 * finding indirect evidence
 * cannot see inside earth
 * use seismic waves
 * speed of waves tells the material

Center of the Earth

 * temperature
 * surface rock is cool
 * 20 meters/warmer
 * every 40 meters 1 degree celsius hotter
 * boy that's hot
 * pressure
 * deeper you the greater the pressure

The crust

 * basalt is the oceanic crust (darker color)
 * granite is the continental crust ( lighter color)**

The mantle
athenosphere is under lithosphere
 * lithosphere is crust + mantle

The core

 * inner core is a dense ball of metal
 * outer core is surrounding the inner core**

Earth's magnetic field
this movement creates the Earth's magnetic fields
 * inner core spins faster than therest of the planet
 * the magnetic field is what causes the arrow of a compass to point north