The magnetic field of the Earth is believed responsible for which of the following?
a. deflection of charged cosmic rays
b. ozone in the upper atmosphere
c. solar flares
d. deflection of both charged and uncharged cosmic rays
A
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Which moons of our solar system are sometimes called the Galilean moons?
A) the four largest moons of Jupiter: Io, Europa, Ganymede, and Callisto B) the two largest moons in the solar system: Ganymede and Titan C) the moons that orbit their planet "backward" compared to their planet's rotation, such as Neptune's moon Triton D) the moons orbiting Uranus, which was once named "planet Galileo"
A quasar's spectrum is hugely redshifted. What does this large redshift tells us about the quasar?
A) the composition of the quasar B) the distance to the quasar C) the mass of the quasar's central, supermassive black hole D) the type of host galaxy in which the quasar resides
A 50-cm3 block of wood is floating partially submerged in water, and a 50-cm3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?
A) the wood B) the iron C) Both have the same buoyant force. D) The answer cannot be determined without knowing the densities of the blocks.
The physical disintegration and chemical decomposition of rock at or near Earth's surface is called ______________
Fill in the blank(s) with correct word