How does the ocean floor preserve evidence of past magnetic reversals
A) Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism.
B) The ocean floor is uniformly old, preserving Earth's 4.6 billion history.
C) Mantle hot spots are always oriented to the magnetic field.
D) Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened.
D
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According to the 1872 General Mining Law, miners can stake claim anywhere on public land, but must pay __________ per acre to take the minerals they find.
A. less than US $5.00 B. US $50.00 C. US $500.00 D. US $5000.00 E. None of these, miners do not have to pay anything, they just have to lay claim to the land.
The official language of the Inca Empire was _________________.
Fill in the blank(s) with the appropriate word(s).
What is an essential characteristic of the scientific method?
A) Uncertainty of the question becomes an absolute certainty after using the method. B) The hypotheses are always testable by careful observation and/or experiment. C) The questions asked are designed to always prove that the hypothesis is incorrect. D) Scientific observations always support the questions asked.
The boundary between the zone of accumulation and the zone of ablation of a glacier is called the
A. moraine B. ablation zone C. firn D. equilibrium line