a branch of the Indo-European family of languages, including especially Irish, Scottish Gaelic, Welsh, and Breton, which survive now in Ireland, the Scottish Highlands, Wales, and Brittany. adjective. 2. of the Celts or their languages.
Movement of tectonic plates-higher. Volcanoes, mountains and earthquakes occur at the edges of tectonic plates-their creation depends on the direction the plates are moving.
The theory of plate tectonics states that the plates of the earth move due to convection in the mantle. This is what brings continents together and apart. Plate Tectonics statâ¦es that Earth's crust and the outermost part of the mantle are mechanically connected to each other.