The process of crystallization acts to
What will be an ideal response?
enrich the molten magma in silica.
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About how many stars does a globular cluster have?
A. About a dozen B. Hundreds C. Tens to hundreds of thousands D. Hundreds of millions E. Billions
A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground is
A) 8 J. B) 20 J. C) 60 J. D) 80 J. E) none of the above
An AC series circuit has 16.5 ? resistance, 12.8 ? inductive reactance and 8.27 ? capacitive reactance. If an effective (rms) emf of 145 V is applied, what is the effective (rms) current value?
a. 7.56 A b. 8.47 A c. 0.495 A d. 23.7 A e. 6.89 A
Oceans are about four times as deep as mountains are high. At the bottom of the ocean are
A) towering mountains, deep valleys, and deep trenches near the continental borders. B) thick layers of basaltic crust at mid-ocean ridges that gradually thin near deep ocean trenches. C) towering plutonic mountains created from volcanoes and fissures at oceanic ridge areas. D) all of these