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
Plastid composition of egg cells from green, white, and variegated four-o'clock plants.
A Punnett square depicting a cross between two pea plants heterozygous for purple (B) and white (b)
Eastern gray squirrel drey
A white dwarf star in orbit around Sirius (artist's impression)
Urinary tract infection. A UTI is characterized by fever, lumbar or abdominal pain, and pain or burn
Case of ONJ that occurred spontaneously. Note the white area, which is exposed necrotic bone.