What are the fundamental building blocks of all matter?
a. atoms
b. compounds
c. ions
d. molecules
e. electrons
a
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If water at 4°C slightly decreases in temperature, the water
A) contracts. B) expands. C) neither of these
We observe that a moving charged particle experiences no magnetic force. From this we can definitely conclude that
A) no magnetic field exists in that region of space. B) the particle must be moving parallel to the magnetic field. C) the particle is moving at right angles to the magnetic field. D) either no magnetic field exists or the particle is moving parallel to the field. E) either no magnetic field exists or the particle is moving perpendicular to the field.
The greenhouse effect is the
A) generation of heat in the outer layers of the Earth's atmosphere due to absorption of short wavelength radiation B) generation of heat in the ozone layer due to the absorption of ultraviolet radiation C) release of heat by volcanism along tectonic plate boundaries D) trapping of infrared radiation from the Earth's surface by greenhouse gases like carbon dioxide, methane, and water
Loudness of sound is most closely related to
A) frequency. B) wavelength. C) amplitude. D) speed.