Most glasses and some minerals exhibit a type of fracture characterized by nested and curved crack surfaces. What term describes this property?
What will be an ideal response?
conchoidal fracture
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In order to calculate the size and luminosity of a galaxy, you must first determine its ____
a. age b. mass c. shape d. metallicity e. distance
Graphical Addition: Refer to the figure, which shows four vectors 
,
, 
, and 
.
(a) Vector 
as
expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.(b) Vector 
as expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.
Fill in the blank(s) with the appropriate word(s).
Differences in apparent magnitude correspond to ratios of ________.
A. luminosity B. brightness C. distance D. temperature E. mass
A bow wave is produced when a speed boat moves
A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces. D) none of the above