Which statement about the formation of the magnetic field of Earth is true?
A) Its formation is a result of magnetic materials in the core.
B) Its formation is a result of the movement of magnetic materials in the core.
C) It constantly forms, is lost, and is regenerated.
D) It is more strongly observable at relatively low temperatures.
Answer: C
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What is this bowl-shaped, glacially carved feature?
A) Hanging valley
B) Arête
C) Cirque
D) Continental ice sheet
Match the textural term to the correct rock
A) nonfoliated rock with large calcite crystals B) coarse-grained rock containing plagioclase, quartz, potassium feldspar, and hornblende C) biochemical rock comprising shells made from calcite D) pyroclastic rock with particles less than 4 mm in diameter E) coarse-grained rock with large angular particles cemented with mud F) foliated rock exhibiting banding 17) Marble 18) Breccia 19) Tuff 20) Granite 21) Coquina 22) Gneiss
In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn + 2 OH- ? ZnO + H2O + 2e- rxn B: 2 MnO2 + H2O + 2e- ? Mn2O3 + 2 OH- What is undergoing reduction?
A) Zn B) ZnO C) MnO2 D) H2O E) OH-
The heterosphere:
A) lies below the homosphere. B) contains primarily heavy gases. C) is populated primarily by variable gases. D) is named for its chemical homogeneity.