When we glimpse the chromosphere at the start and end of totality, its color is:
A) green (the famous flash).
B) yellow, like the photosphere below it.
C) red, due to ionized hydrogen at lower pressure.
D) blue, due to the ionization of nitrogen by the magnetic fields.
E) white from the moonlight.
C
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The amount of 
C in a bone is about one-fourth of what one would expect based on the relative abundance of 
C and 
C. Since the half-life of 
C is a bit less than 6000 y, the
bone’s age is closest to A. 36,000,000 y. B. 24,000 y. C. 12,000 y. D. 4000 y. E. 1500 y.
The presence of which rocks show that between 2 and 3 billion years ago the atmosphere contained less than 1% of the amount of oxygen it contains today?
A) limestone B) banded iron formations C) silicate clays D) sandstone
Conservation of angular momentum explains why the contracting solar nebula's rotation rate increased as it contracted
Indicate whether the statement is true or false
A ________ lens is used to compensate for hyperopia
Fill in the blank(s) with correct word