Where are volcanoes most common?
a. subduction zones
b. transform boundaries
c. folded mountain ranges
d. continental basins and ranges
e. plates pushing against one another
a
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In hot-work, a metal is deformed at temperatures that are either above the ___________temperature, or above 50 % of the absolute melting temperature.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about the celestial equator is true at all latitudes?
A) It lies along the band of light we call the Milky Way. B) It represents an extension of Earth's equator onto the celestial sphere. C) It cuts the dome of your sky exactly in half. D) It extends from your horizon due east, through your zenith, to your horizon due west. E) It extends from your horizon due north, through your zenith, to your horizon due south.
We know the Sun is primarily made from hydrogen and helium on the basis of its
A) luminosity. B) spectrum. C) age. D) color. E) mass.
When is the soonest we are likely to have moderate-resolution images and spectra of Earthlike planets around other stars?
A) in a decade or two, through space observatories now in the early planning stages B) in just a few years, through analysis of observations by the GAIA mission C) any day now, thanks to our largest ground-based telescopes D) in just a few years, through analysis of observations by the James Webb Space Telescope