Examlex
The most common time for a spontaneous abortion, or miscarriage, is during the third trimester.
Hogback
A narrow ridgeline with steep slopes on both sides, commonly formed from the erosion-resistant edge of a tilted sedimentary rock layer.
Unmetamorphosed Sandstone
Sandstone that has not undergone metamorphism and retains its original sedimentary characteristics.
Cleavage
The tendency of a mineral to break along flat planar surfaces as determined by the structure of its crystal lattice.
Foliation
A feature of metamorphic rocks where mineral grains are arranged in planes or bands, giving the rock a layered appearance.
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