Which group contains only features that can be seen on the surface of Mars?
A. craters, canyons, polar caps, volcanoes
B. polar caps, oceans, dried up riverbeds
C. canyons, oceans, volcanoes, polar caps
D. All of these choices are correct.
Answer: A
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The last page of a book is numbered 764 the book is 3.0 cm thick not including its covers. What is the average thickness in centimeters of a page in the book rounded to the proper number of significant figures
A) 0.0039 cm
B) 0.072 cm
C) 0.0079 cm
D) 0.00393 cm
E) 0.00785 cm
In order for the atoms in a neon discharge tube (or a neon beer sign) to emit their characteristic orange light, it is necessary that
A) there be no unoccupied energy levels in each atom. B) each atom carry a net electric charge. C) the atoms be continually replaced with fresh atoms, because the energy of the atoms tends to be used up with continued excitation, resulting in dimmer and dimmer light. D) electrons first be given energy to raise them from their ground state to an excited state.
Who first accurately measured the value for the charge of the electron?
Stars are powered by ________
Fill in the blank(s) with correct word