Lightning between a cloud and the surrounding air is called
a. air discharges.
b. cloud discharges.
c. ground discharges.
d. intracloud discharges.
a
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Projectile Motion: As shown in the figure, a heavy rock is shot upward from the edge of a vertical cliff. It leaves the edge of the cliff with an initial velocity of 15 m/s directed at 25° from the vertical and experiences no appreciable air resistance as it travels. How high is the cliff?
Fill in the blank(s) with the appropriate word(s).
Estimation: A reasonable estimate for the mass of a typical female college student is
A. 20 kg. B. 50 kg. C. 150 kg. D. 200 kg.
The three principal types of mountain building are volcanic, fault-block, and ______________
Fill in the blank(s) with correct word
Scientists once thought that Earth's primary atmosphere was composed of _____
A) hydrogen and methane B) nitrogen and oxygen C) carbon dioxide and methane D) oxygen and hydrogen