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The Admissions Officer from a large university mailed a survey to 600 students selected at random.The sample was designed to include 150 students randomly selected from each of the freshman,sophomore,junior,and senior classes on campus.What sampling method was used?
Cross-Cutting
Relates to geological features that intersect or cut across other geological formations, indicating a relative age relationship.
Inclusions
Pieces of one rock unit that are contained within another, indicating that the included pieces are older than the host rock.
Sedimentary Rocks
Rocks formed by the accumulation and consolidation of sediment, often containing fossils of plants and animals that lived millions of years ago.
Sedimentary Rocks
Rocks formed from the accumulation and cementation of mineral and organic particles, often in layered deposits.
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