The photosphere
A. is the hottest part of the Sun.
B. is the layer of the Sun where it transitions from being opaque to transparent.
C. is the densest part of the Sun.
D. is the part of the Sun where nuclear fusion is occurring.
Answer: B
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The pressure of an interstellar gas cloud depends on the cloud's ____________________ and ____________________
Fill in the blank(s) with correct word
To explain retrograde motion as well as changes in planetary brightness, Ptolemy's model used ________
Fill in the blank(s) with correct word
Vector 1 is 7 units long and is at 70°. Vector 2 is 5 units long and is at 155°. Vector 3 is 3 units long and is at 225°. Which vector has equal-magnitude components?
a. Vector 1 b. Vector 2 c. Vector 3 d. None of the vectors has equal-magnitude components.
Glacial debris is generally
A) well rounded and well sorted. B) a mishmash of shapes and sizes. C) unstriated. D) angular and well sorted.