Download How the U.S. was Formed

How the U.S. was Formed
1.
Glaciers (dashed lines) once covered parts up the upper Midwest. How far south did the glaciers move?
2.
Unconsolidated sediment (yellow) are signs of ancient seas.
a.
Which type of rock is unconsolidated sediment (circle)?
Igneous
b.
From the Gulf of Mexico, how far north did the Gulf of Mexico travel?
3.
Metamorphic
Sedimentary
c.
How far inland did the Atlantic Ocean make it on the east coast (hint: what mountain range is there)?
d.
Which central US state had a large lake in the middle of the state (hint: there is a yellow blob in the middle)?
e.
How far west did the Pacific Ocean make it on the west coast? (hint: what mountain range is there)?
f.
Using yellow crayon or yellow marker, color on the back the locations in the U.S. that used to have these ancient seas (accurate but not perfect).
Ohio has two different colors; blue (which is limestone) and pink (which is other sedimentary rock). From your readings…
a.
From where does limestone originate?
b.
If Ohio is covered in limestone, what must have been in Ohio’s water?
4.
The central part of the U.S. (Nebraska, Kansas, Oklahoma) is almost all sedimentary rock (pink). This area has one of the windiest locations in the US. Does the
rock type match the weather conditions? Why?
5.
Under the Igneous category, find Felsic Intrusive rock (hot pink color).
a.
On the opposite side, using pink dashed lines, identify the ~6 major locations that contain felsic intrusive rock.
b.
What does the name felsic imply about the color of this rock?
6.
c.
What does the name intrusive imply about the location in the earth of this rock?
d.
What does the name imply is underground and near the surface in these areas?
Find the intermediate and mafic rock in the igneous category (greenish colors).
a.
If these rocks have fine, extrusive crystals, what must have happened in years past in these locations?
b.
Using green, highlight the areas on your map that contain intermediate and mafic rock.
7.
Under the metamorphic category, find felsic gneiss and schist (army green). These rocks are noted for forming rubies and sapphires; where in the U.S. would you
hunt for these gems?
a.
b.
c.
d.
e.
8.
Under the metamorphic category, find metasedimentary rock (orange) which is noted for forming garnet; where in the U.S. would you hunt for these gems?
a.
b.
c.