1. Chapter 3 Vocabulary Seismic waves Pressure Crust Basalt Granite
CRUST: Continental or oceanic
Seismic waves
Pressure
Crust
Basalt
Granite
Mantle
Lithosphere
Asthenosphere
Mesosphere
Outer core
Inner core
Lithosphere
Asthenosphere
Mesosphere
Outer Core: Liquid
Inner Core: Solid

2. How do Geologists learn about Earth’s interior?
Evidence from rocks
Scientists drill for rocks. We have drilled 7 miles deep.
Sometimes volcanoes blast rock out from deep within the earth (62 miles deep!)
Scientists experiment on rocks in the laboratory to see how rocks react to extreme pressure
Evidence from seismic waves
Waves generated inside the Earth from Earthquakes
Scientists study how the waves travel to determine what's inside the Earth
Seismic waves tell us where the material inside the Earth changes. Example: from Rock to liquid
We can look at the path the wave takes…. Like waves around an island in the ocean.

3. What are the features of the Earth’s Crust, Mantle and Core?
The three main layers of Earth are the crust, the mantle, and the core. These layers vary greatly in size, composition, temperature, and pressure.
The deeper down inside the Earth, the greater the pressure on the rocks down there
The temperature increases as you go deeper into the Earth.

4. The Crust
The crust is a layer of solid rock that includes both dry land (continental) and ocean floor (oceanic)
The main elements are oxygen and silicon
It is the upper most layer and is the thinnest of all the layers
Continental crust is mostly granite and is thicker than Oceanic crust which is mostly basalt.

5. The Mantle
The rock is very hot but solid. It is nearly miles deep.
The lithosphere
The Astehnosphere
The mesosphere

6. The core The core is made mostly of the metals iron an nickel.
Outer core: around the inner core, it is a layer of molten metal
Inner core: at the center of the Earth is a dense ball of solid metal

7. What does the core have to do with Earths magnetic field?
Movement within the liquid outer core is believed to create earths magnetic field.
The Earth is like a giant magnet. This is why a compass points to magnetic north and not true/geographic north.