A star with the same color as another but 100 times brighter must be ________
A) 100 times hotter
B) 100 times closer
C) 100 times colder
D) 100 times larger
E) none of the above
D
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How can the age of a sample be determined from a graph of daughter and parent atoms versus time?
A) The y-intercept will show the amount of sample present in a certain mass. B) The intersection of the daughter and parent atom lines will show the age. C) The ratio of daughter to parent atoms will show the age. D) The slope can be interpreted to find the age.
Which of the following is not a reason for the seasons?
A) the revolution of Earth around the Sun B) the timing of Earth's perihelion and aphelion C) Earth's axial tilt D) the oblate spheroidal shape of Earth E) the orientation of Earth's axis
Which of the following is an ecological legacy?
A) water B) logging of forests C) hurricane D) fire E) woody debris left after a fire
Since World War II, what has been considered the dominant engine of the American economy?
A. travel B. production C. consumption D. food