Crossword puzzle clue "layers as in geology class"

Here are the possible solutions for layers as in geology class clue

Answer
Clue
Relevancy
strata
Clue
Layers, as in geology class
laminations
Clue
Layers upon layers
Definition
LAMINATION, the act of laminating
onion
Clue
It has layers upon layers
Definition
to apply an onion, an edible bulb, to
eons
Clue
Geology class periods [subscribe to the best indie xwords today at avxwords.com]
Definition
EON, a long period of time, also AEON
mica
Clue
Flakes in geology class
Definition
a rock-forming mineral (muscovite, biotite, lepidolite, etc.) with perfect basal cleavage
moltenlava
Clue
You might have heard about how it gets expelled in geology class
ores
Clue
They're graded in geology class
Definition
ORE, rock containing a valuable metal, also OWRE
aeon
Clue
Unit in a geology book
Definition
the largest division of geological time, composed of several eras, also EON

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