Key Idea: The loose rock material on the surface of the earth broke off from the solid rock layer (bedrock) that makes up the outer portion of the earth.

Students are expected to know that:

  1. Broken rocks form a relatively thin layer of loose rock material on the surface of the earth.
  2. Most of the loose rocks on the surface of the earth originally came from the breaking of the solid rock layer (bedrock) that makes up the outer portion of the earth. These rocks continue to break, such that large loose rocks (e.g., boulders), are broken down to even smaller rocks (e.g., sand).
Percent of students answering correctly (click on the item ID number to view the item and additional data)
Item ID
Number
Knowledge Being Assessed Grades
6–8
Grades
9–12
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WE037004

All loose rock material came from earth's solid rock layer

62%

66%

WE022004

Very large rocks the size of boulders can come from breaking off from earth's solid rock layer and from breaking off from larger rocks.

55%

60%

WE021002

Both large and small loose rocks on the surface of the earth were once part of earth's solid rock layer.

35%

40%