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 movement of the tectonic plates alter the surface of the Earth every single day, even if slowly. Earthquakes, volcanos, mountain building, subduction zones, rift zones, sea floor spreading, lava flows, pyroclastic flows, all are the result of active plate tectonics.