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Howel "Willie" Williams

Geology Researcher #2
Across
Mr Williams was called "the Last of the _________" a Celtic tribe that resisted Roman Invasion.
Wrote a monograph on _____ Lake.
Mr. Williams taught _________, a branch of petrology that focuses on detailed descriptions of rocks.
tiny, extinct Fossilized animals that lived together in groups or colonies and shared the same skeleton, which was like an apartment building.
A volcano located in the Mexican state of Michoacán.
a large cauldron-like depression that forms following the evacuation of a magma reservoir.
Down
Circular mound-shaped protrusions resulting from the slow extrusion of viscous lava.
a rigorous branch of modern science.
A type of rocks composed solely or primarily of volcanic materials.
"Ordovician _______ " An era when a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land