#  Structure of the Earth 

 



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### Earth Globes

\[M | t | —\]  
α Geopolitical and sectioned Globes.

### Mercator Projection

\[M | t++ | ★★\]   
A map projection in which the meridians and parallels of latitude appear as lines crossing at right angles and in which areas appear greater farther from the equator.  
  
\[[In-Depth Description](/presentations/mercator-projection)\]

### Rock Samples

\[S | t | ★★\]  
Selection of igneous, sedimentary and metamorphic rocks.  
  
\[[In-Depth Description](/presentations/rock-samples)\]

### Crystal Models

\[S/M | t | —\]  
All the classics.

### Topological Map of Oceans

\[L | t | —\]  
1m x 2m Mercator projection with ocean floor detail.

### Seismic Wave Refraction

\[M | t++ | ★★★\]   
Total internal refraction of laser beam through sugar solution with refractive index gradient; representative of seismic waves through Earth's mantle.  
  
\[[In-Depth Description](/presentations/seismic-wave-refraction)\]

### Earth's Magnetic Field

\[S | t | ★★\]   
OHP representation of lines of force using bar magnet and iron filings.  
  
\[[In-Depth Description](/presentations/earths-magnetic-field)\]

### Centrifugal Eggbeater

\[M | t | ★★★\]  
Spinning frame that demonstrates equatorial bulge (oblateness).  
  
\[[In-Depth Description](/presentations/centrifugal-eggbeater)\]

### Coriolis Effect

\[XL | t+ | ★★★\]   
As demonstrated by two people throwing a volleyball to each other while sitting on rotating platform.  
  
\[[In-Depth Description](/presentations/coriolis-effect)\]

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu