Posted: August 23rd, 2021

PNW Cross-section

 
Start with the map of the pacific northwest :
mapPNW.pdf
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Identify the following (sometimes marking or coloring your map can help)

a convergent boundary
a divergent boundary
Mt Rainier
the coastline

Now draw a line across the map that starts on the left edge and crosses through Mt Rainier. You will be drawing an underground sketch or cross section along this line that looks something like this:

This is a Cross Section image of this region. It is a SKETCH not a technical cross section.  To this sketch you need to add the following:
one location and example rock for:

formation of non-foliated rocks
formation of foliated rocks
formation of intrusive rocks
formation of extrusive rocks
formation of sedimentary rocks

Also indicate where:

flux melting occurs
decompression melting occurs
sedimentary process of weathering, erosion, and transport may occur
earthquakes may occur
mantle convection occurs

And label:

the accretionary prism
a trench
a volcano that is part of a continental volcanic arc
2 different types of plate boundaries
2 different types of crustal plate
plate motion with arrows

 

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