Trenches suck  lighter heavier   more viscous less viscous 

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Presentation transcript:

Trenches suck

 lighter heavier   more viscous less viscous 

Seismic Velocities Lunar________________Seismic Velocity (km/sec) Basalt Basalt Near surface layer Terrestrial rocks_______Seismic Velocity (km/sec) Granite Gneiss Basalt Sandstone Marble Limestone Cheese_______________Seismic Velocity (km/sec) Sapsego (Swiss) Romano (Italy) Cheddar (Vermont) Muenster (Wisconsin)