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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

Which type of curve would accurately represent a closed orbit?

a. ellipse b. hyperbola c. parabola d. straight line

Physics & Space Science

Of these properties of waves, which one is independent of the others?

A. amplitude B. speed C. frequency D. wavelength

Physics & Space Science