Science Quiz / 'A' in Geology

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Can you name the answers to these Geology questions where all of the answers begin with 'A'?

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LettersinGeologyA
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Subclass of mollusc not to be confused with modern nautiloids that went extinct at the K/T boundary
Extrusive igneous rock of intermediate composition often found at convergent plate margins
In 1837, he was the first to scientifically propose that Earth was subject to a past ice age
Formal name for the theory that dinosaurs were killed by an asteroid impact
Upper region of the mantle that is ductilely deforming
One of the current tectonic plates that was once part of Gondwanaland*
A North American orogeny associated with the formation of Pangaea*
Either end member on the Ca-Na continuum of plagioclase feldspar*
Soft-bodied animal phylum with multiple circular segments
Animal phylum with the most extant species; having segmented bodies and exoskeletons
Glacially carved feature picutred above (#1)
A polymorph of kyanite pictured above (#4) named for a region in southern Spain
Cryptocrystalline variety of silicia (quartz) often used in jewelry
A natural rock exposure through which a hole has completely formed; pictured above (#3)
Cone-shaped stream deposit of sediment pictured above (#2)
Eon of Earth's history (4 to 2.5 billion years ago) during which the first continental crust formed

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