The probe tip of a scanning probe microscope
A. floats above the atoms of a sample.
B. chemically changes the atoms of a sample.
C. etches into the atoms of a sample.
D. injects a magnetic field into the atoms of a sample.
Answer: A
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The bob at the end of a vertical spring vibrates up and down once every 2 s. Its frequency is
A. 2 Hz. B. more than 2 Hz. C. 0.5 Hz. D. none of the above
The acceptance of plate tectonics after the initial rejection of continental drift has been described as a scientific revolution. Explain why plate tectonics was so revolutionary and what tools were used to bring it about
What will be an ideal response?
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A) guyots B) nemataths C) seaknolls D) seamounts E) islands
By the year 2025, it is projected that ________ of the world's population will live in water-stressed areas.
A. 25% (one-fourth) B. 66% (two-thirds) C. 33% (one-third) D. 90% (nine-tenths)