Noun. 1. lower mantle-the deeper part of the mantle. layer-a relatively thin sheetlike expanse or region lying over or under another. mantle-the layer of the earth between the crust and the core.1  Facebook.. lower mantle-the deeper part of the mantle. layer-a relatively thin sheetlike expanse or region lying over or under another. mantle-the layer of the earth between the crust and the core.
Constitutional amendment. A constitutional amendment refers to the modification of the constitution of a nation or state. In many jurisdictions the text of the constitution itself is altered; in others the text is not changed, but the amendments change its effect. The method of modification is typically written into the constitution itself.
Amendments Law and Legal Definition. An amendment in a legal context refers to a change made by a legislative or parliamentary process. The founding fathers devised a dual process by which the U.S. Constitution could be changed. The first option must begin in Congress which, by a two-thirds vote (of a quorum) in each house, may initiate an amendment.