Sunspots:
A) are always found close to the Sun's poles.
B) come in pairs, representing the north and south magnetic fields.
C) were most numerous during the Maunder Minimum.
D) travel over the surface of the Sun from pole to pole.
E) are relatively constant in number every year.
B
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If scientists excavate two fossils at the Grand Canyon, one of which was found at a much deeper rock layer than the other, what can we assume about the fossils?
A) The fossil found in a deeper layer is older. B) The fossil found in a deeper layer is younger. C) The fossil found in a deeper layer is not as well-preserved. D) The fossil found in a deeper layer has a higher carbon-12 abundance.
An object undergoing free fall experiences
A. an increase in both its acceleration and velocity B. a decrease in its acceleration and an increase in its velocity C. a constant acceleration and an increase in its velocity.
The ______________ for compounds are written by putting the composing elements' symbols adjacent to each other, with subscripts indicating the number of atoms of each
a. equations b. molecules c. isotopes d. formulas
A string on a guitar is plucked. If, at this instant, someone touches this guitar string at its center, at which of its harmonics given below would the string be able to vibrate? sity?
1.at the first harmonic only 2.at the first and third harmonics 3.at the second and fourth harmonics 4.at the first and second harmonics