The ____________________ of the Sun is not visible during a total solar eclipse
Fill in the blank(s) with correct word
photosphere
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The smelting of a metal
(a) Raises the temperature above the melting point. (b) Separates the metal from the ore. (c) Deforms the metal into a shape. (d) Cools the metal very rapidly from a high temperature.
The age of the whole Galaxy has been found from studies of its oldest stars in the ________ clusters that orbit in the Halo
Fill in the blank(s) with correct word
A very loud train whistle has an acoustic power output of 100 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 89.0 meters from the train? (I0 = 10?12 W/m2)
a. 20.7 dB b. 70.0 dB c. 90.0 dB d. 95.0 dB e. 207 dB
The metamorphic property of flat or elongated mineral grains in parallel layers is called
A) schist. B) cleavage. C) foliation. D) lithification.