Rock is composed of different combinations of minerals. Smaller rocks come from the breakage and weathering of bedrock and larger rocks. Soil is made partly from weathered rock, partly from plant remains--and also contains many living organisms. Benchmark 4C The Physical Setting: Processes that Shape the Earth Grades 6-8, page 73
The Celts (/ËkÉlts/ , occasionally /ËsÉlts/ , see pronunciation of Celtic) were people in Iron Age and Medieval Europe who spoke Celtic languages and had cultural similarities, although the relationship between ethnic, linguistic and cultural factors in the Celtic world remains uncertain and controversial.
The oldest archaeological evidence of the Celts comes from Hallstatt, Austria, near Salzburg. Excavated graves of chieftains there, dating from about 700 bce, exhibit an Iron Age culture (one of the first in Europe) which received in Greek trade such luxury items as bronze and pottery vessels.