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.
Earthquakes are caused by the movement of the tectonic plates underneath Earths surface. Volcanic eruptions only happen in certain places because they only form on the plate boundaries where there is a subduction boundary. Earthquakes are caused by the movement of the tectonic plates underneath Earths surface.