GeoJeopardy! Fridays

Time for GeoJeopardy! Fridays, because my first PhD exam is today, oh boy. Some of these seem to be a little bit harder than normal.

- Geology -

A deep ravine that's often dry in the summer, it shares its name with a "grand" dam in Washington state

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 This layer of rock between the earth's core & crust makes up about 85 percent of the planet's mass

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From the Greek for "without shape", this term refers to rocks & minerals that have no crystalline structure

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Lamina is a layer in this type of rock that is less than 1 cm. in thickness & is visually separable from other layers

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"Bovine" term for a crescent-shaped lake formed in an abandoned river bend

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All the answers as well as any other previous GeoJeopardy! questions can be found over at my website by clicking the link.  

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Questions courtesy of j-archive.com