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What layer floats?
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
It Is Known As The Asthenoshere
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
Decane will float on top
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.