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Home Q & A Board Science-Related Homework Help Physics Astronomy
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Sakura Sakura
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6 years ago
Because the changes in energy levels happen in discrete steps, we refer to these as ________ leaps.
 
  Fill in the blank(s) with correct word

Question 2

No stars have been found composed solely of Hydrogen and Helium (and no heavier elements).
 
  Indicate whether the statement is true or false

Question 3

On average, how often do impactors about 10 km in size, large enough to produce mass extinction, hit Earth?
 
  A) once every century
  B) once every thousand years
  C) once every million years
  D) once every hundred million years
  E) once in Earth's history
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thatguythatguy
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6 years ago
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Sakura Author
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#2
6 years ago
tremendous help
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