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 Celts were first referenced in texts about 2,500 years ago. Many of the ancient sources, however, were written by Greeks, Romans and other non-Celts. Evidence indicates that the Celts were spread out across a vast area of continental Europe. They lived as far east as modern-day Turkey and even served as mercenaries for the Egyptian queen Cleopatra.