What are the two criteria used in Table 54.1 to identify and classify igneous rocks?
Texture and mineral composition
Physics & Space Science
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Which of the following could not be measured by an observation that uses only imaging?
A) the rate at which a variable star brightens and dims B) the general shape of an interstellar cloud of gas C) the color of a planet D) the brightness of a star in our sky E) the number of bright stars in a nearby star cluster
Physics & Space Science
What charge appears on the plates of a 2.00 ?F capacitor when it is charged to 100. V?
What will be an ideal response?
Physics & Space Science
Radioactivity Basics: Neodymium 
Nd is an isotope that undergoes alpha decay. What isotope is the product of this decay?
A. 
Ba
B. 
Ce
C. 
Pr
D. 
Sm
E. 
Gd
Physics & Space Science
Any model of solar system formation must explain why every planet is relatively isolated in space
Indicate whether the statement is true or false
Physics & Space Science