Stones. Stones were not only the building blocks being used to create pyramids, they served as important tools as well. The two main stone types used in construction were limestone and granite. Low-grade limestone was used in creating the inner walls, while smoother white limestone was used on the outer walls.
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The Articles of Confederation
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One way an amendment to the Constitution can be ratified is to receive three-fourths of state legislatures.
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Answer: Numerous wars and invasions induced the trade in Western Europe to decline severely.
Primary sources are documents, images or artifacts that provide firsthand testimony or direct evidence concerning an historical topic under research investigation.
A secondary source is a document or commentary that quotes or references a primary source, without first-hand knowledge of the activity or event.
A secondary source is a source other than the main source that is used to gather information. Just find another source where the same or additional information can be found.