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As the question uses the word mantle which is a compositional layer of the earth, then the answer is crust.
The Earth's plates float on top of the lithosphere.
The Lower part mantle
The mantle holds up the plates.
It will always, unless it is the same substance (in the same state) or something of equal density. Something of lower denisty always floats on something with higher.
Pieces of earth Hope this helped. :D
Well, technically, convergent boundaries can be wherever there are tectonic plates, and convergent boundaries are just where two plates push together forming a mountain range… or a mid-ocean ridge. So it can be on any layer of earth. By the way I'm only in 6th grade
The earth's mantle.
Tectonic plates float on an underlying molten layer.
The earth's tectonic plates are said to "float" on layers of magma, which is molten, or very hot liquid rock deep under the surface of theearth.