What key features have emerged through the examination of the map of Earth's magnetic field?
What will be an ideal response?
Answer: "1. The pattern of Earth's magnetic field very closely, but not exactly, resembles the field of a bar magnet. The analogy works only if the hypothetical magnet producing Earth's field is located deep in the interior. This observation, made in the nineteenth century, led to the conclusion that Earth's magnetism originates deep within Earth and not at the surface or somewhere in space.
2. The north magnetic pole, where the force lines go into Earth, and south magnetic pole, where the force lines emerge, do not coincide exactly with the geographic north and south poles. Currently, the angular distance between the magnetic and geographic poles is about 18 degrees."
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A) ?on or associated with the bottom B) ?suspended in the water column C) ?by drifting through the water, unable to swim against currents D) ?near the water's surface
A SNP is
A) a mutation that affects eggs or sperm. B) a location in the human genome where the nucleotide sequence differs among individuals. C) almost always a recessive allele. D) a repeat sequence in the human genome.
What texture is displayed by the igneous rock in this photograph?
A. porphyritic B. vesicles C. glassy D. breccia E. None of these choices are correct.
Which of the following compounds could be used to enhance cometabolism of chlorinated solvents in bioremediation?
a. nitrate b. oxygen c. methane d. benzene