The Carboniferous Period began about
A) 475 million years ago
B) 65 million years ago
C) 360 million years ago
D) 542 million years ago
C
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Sunspots
a. are cooler than their surroundings. b. are regions where material is rising from below the photosphere. c. are the result of convection. d. produce spicules. e. are generally found near the poles of the sun during sunspot maximum.
Which of the following most likely explains why Venus does not have a strong magnetic field?
A) It does not have a metallic core. B) Its rotation is too slow. C) It is too close to the Sun. D) It is too large. E) It has too thick an atmosphere.
In projectile motion, which of the following is not constant?
a. Vertical velocity b. Horizontal velocity c. Acceleration d. None of these
If a star collapses to a tenth its size, gravitation at its surface increases by
A) ten. B) twenty. C) one hundred. D) one thousand. E) more than one thousand.