The size and shape assumed by the crystal faces when a mineral crystal has time and space to grow are known as the mineral's ______________
Fill in the blank(s) with correct word
crystal form
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A circular space station (shaped like a big wheel) rotates to produce “artificial gravity”. The apparent weight of an astronaut standing on the inside surface of the outer wall is equal to her weight on earth. The inside surface of the outer wall of the space station is 285m from the axis of rotation. What is the period of rotation of the station?
A. 92 s B. 34 s C. 213 s D. 183 s
What type of observation can astronomers use to measure the composition of an extrasolar planet's atmosphere?
A) comparisons of a star's spectrum when a planet is in transit versus when it is eclipsed B) measurements of the host star's velocity throughout an orbital cycle C) measurement of how frequently the planet blocks the host star's light D) combination of a transit observation and a Doppler shift measurement
The surface of Venus is much hotter than the Earth because it
A) has no magnetic field B) has a very thick atmosphere of carbon dioxide C) has a much higher rate of volcanic activity D) is closer to the Sun
A negatively-charged balloon touching a wooden wall
A) pulls positive charge on the wall surface toward it. B) pushes negative charge in the wall away from it. C) polarizes molecules in the wall. D) all of the above E) none of the above