The length of the Appalachian Trail is 2,015 miles. How long is it in kilometers?
A) 3,245 km
B) 1,251 km
C) 3,112 km
D) 1,008 km
E) 963 km
A
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According to updated models of the formation of the Solar System, Earth's early atmosphere probably consisted mostly of:
A) hydrogen, ammonia, and methane. B) neon, argon, and radon. C) butane, ethane, and hexane. D) carbon dioxide, nitrogen, and water vapor.
Seasons on Mars
A) are similar to those on the Earth but are nearly twice as long B) are exactly the same at the Earth C) are more intense than on the Earth but the same length D) are similar to those on the Earth but half as long
Why are the star clusters in tidal tails blue?
A) They are sad at being left behind. B) The individual stars were red before the interaction, and an injection of new matter onto them turned them blue. C) Blue stars are less massive and are therefore pulled away by tidal forces more easily. D) Blue stars are more massive and therefore have greater inertia, so they stay in place while the rest of the galaxy keeps moving. E) Blue stars in these newly active star-forming regions far outshine the less massive red stars.
Like our own moon, many Jovian moons exhibit what is called synchronous rotation. This means that they rotate at the same rate
A) that their host planet rotates B) as all other moons around the host planet C) that the host planet orbits about the Sun D) that they orbit their host planet