The hollow depression left when a shell or bone is dissolved completely out of a rock is called a(n) ______________
Fill in the blank(s) with correct word
mold
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Stars within a cluster that are at the turnoff point
a. have life expectancies that are equal to the age of the cluster. b. are stars that are just becoming white dwarfs. c. are stars that are just entering the main sequence portion of their evolution. d. are stars that are about to supernova. e. are stars that are generally spectral type G stars.
The most important idea in Copernicus' De Revolutionibus was placing the _______________ at the center of the Universe
Fill in the blank(s) with correct word
Starting from rest, a proton falls through a potential difference of 1.2 kV. What speed does it acquire?
What will be an ideal response?
The Sun's average surface (photosphere) temperature is about ________
A) 1,000 K B) 5,800 K C) 1,000,000 K D) 37,000 K