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.
Gravity caused many of these pieces to draw together and form the moon, which took up orbit around its creator. The flow of the mantle beneath the crust causes plate tectonics, the movement of the large plates of rock on the surface of the Earth.