C-type asteroids are the most common variety, forming around 75% of known asteroids. They are volatile-rich and distinguished by a very low albedo because their composition includes a large amount of carbon, in addition to rocks and minerals. They have an average density of about 1.7 g/cm . They lie most … See more Asteroids of this class have spectra very similar to those of carbonaceous chondrite meteorites (types CI and CM). The latter are very close in chemical composition to the Sun and the primitive solar nebula minus hydrogen See more C-group (Tholen) In the Tholen classification, the C-type is grouped along with three less numerous types into a wider C … See more • Asteroid spectral types See more Webzeolite. Of these choices, which rock type was formed under the "lowest grade" of metamorphism? slate. Which rock type forms next (in order of metamorphic grade) after Schist? gneiss. Which metamorphic facies name is used to describe the conditions of 600˚C and pressures equivalent to a depth of 20 km?
Chapter 7: Sedimentary Environments and Rocks Flashcards
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Ch. 7: Sedimentary Rocks Flashcards Quizlet
Web1) Clastic -- discrete fragments cemented and compacted together; all detrital sedimentary rocks have clastic texture. 2) Nonclastic or crystalline -- minerals form a pattern of interlocking crystals. Clastic. Rocks with a clastic texture consist of discrete fragments and particles that are cemented and compacted together. Webc) contains many small holes d) all of the above d) all of the above As the rate of cooling increases, the size of the crystals that form: decreases Which one of the following is an igneous rock? a) limestone b) rhyolite c) slate d) shale rhyolite Intrusive rocks: a) are generally fine grained b) form at Earth's surface c) are quite often vesicular chip protector