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As Lava Cools and Solidifies from the Surface Down, Cracks

question 37

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As lava cools and solidifies from the surface down, cracks frequently grow downward through the rock. Such cracks are called:


Definitions:

Intrinsic Factor

Factor secreted by the parietal cells of gastric glands and required for adequate absorption of vitamin B12.

Mucous Cells

Specialized cells present in various glands and tissues that produce and secrete mucus.

Parietal Cells

Cells located in the lining of the stomach that secrete hydrochloric acid and intrinsic factor.

Chief Cells

Cells found in the stomach lining that secrete pepsinogen, an enzyme precursor important for digestion of proteins.

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