The odds of a 100-meter asteroid hitting Earth over the course of one year is approximately __________.
Fill in the blank(s) with the appropriate word(s).
less than 1 in 1000
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The age of a star cluster can be determined from the ____________________ of the cluster
Fill in the blank(s) with correct word
At which lunar phase(s) are tides most pronounced (for example, the highest high tides)?
A) both new and full moons B) both first and third quarters C) full moon only D) new moon only E) third-quarter moon only
Which experiences the least electrical force in an electric field?
A) alpha particle B) beta particle C) electron D) gamma ray E) all the same
Rays that go through the focal point to a concave mirror return:
a. back on themselves. b. parallel to the optic axis. c. perpendicular to the optic axis. d. at many different angles from the mirror surface. e. at many different angles relative to the optic axis.