Immediately after the Permian extinction event, the carbon dioxide and methane released by volcanism caused the Earth to
A) initiate a snowball Earth phase
B) start an ice age
C) begin a period of intense global warming
D) completely change the composition of its atmosphere
C
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Which type of curve would accurately represent a closed orbit?
a. ellipse b. hyperbola c. parabola d. straight line
Of these properties of waves, which one is independent of the others?
A. amplitude B. speed C. frequency D. wavelength
The choices describe four hypothetical planets. Which one would you expect to have the hottest interior? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: twice as big as Earth Distance from Sun: same as Mercury Rotation rate: once every 6 months B) Size: same as the Moon Distance from Sun: same as Mars Rotation rate: once every 10 days C) Size: same as Mars Distance from Sun: same as Earth Rotation rate: once every 18 hours D) Size: same as Venus Distance from Sun: same as Mars Rotation rate: once every 25 hours
How would you classify the following material?
swimming pool water A) homogeneous mixture B) heterogeneous mixture C) a pure element D) a pure compound E) depends on how many children have been in it