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What Factor Is Essential to the Continued Survival of a System

question 1

Multiple Choice

What factor is essential to the continued survival of a system of stratification?

Definitions:

Igneous Feature

A geological structure formed from hardened lava or magma, such as a volcano or granite intrusion.

Dike

A sheetlike intrusion that cuts across any layers in a host rock, commonly formed with a steep orientation.

Sill

A tabular igneous intrusion that parallels layers or other planar structures of the surrounding rock and which usually has a subhorizontal orientation.

Laccolith

A bulge-shaped igneous body that has domed and tilted overlying layers and that is observed or interpreted to have a relatively flat floor.