The white granite of the Idaho Batholith near Boise, Idaho, contains dark gray xenoliths of metamorphic material. Which is older? How do you know?
A) Granite; the principle of superposition
B) Xenoliths; the principle of cross-cutting relations
C) Granite; the principle of unconformities
D) Xenoliths; the principle of inclusions
Question 2
The Mississippi River cuts through Silurian-aged dolomite between northwestern Illinois and eastern Iowa. Which is older? How do you know?
A) Dolomite;the principle of superposition
B) Mississippi; the principle of original horizontality
C) Dolomite; the principle of cross-cutting relationships
D) Mississippi; the principle of lateral continuity
Emperor penguins with their black and white plumage stand out against the snow and colonies
The five different types of leukocytes (white blood cells).
The first dark spot observed on Uranus. Image obtained by the HST ACS in 2006.
White Blood Cells
Dark Blue Eye Color
Gray Morris's Calculate with Confidence, Canadian Edition, 2nd Edition