Page 15 - Curriculum Visions Dynamic Book. To close the book, close the tab.

 Copper – Pure native copper is orange–red when fresh, but its compounds are often green.
Copper
An orangy–red soft metal. Copper changes to brown when exposed
to the air. It was one of the
first metals to be used in the ancient world. Its name comes from the Latin cuprum, which means ‘metal of Cyprus’, an island in the Mediterranean Sea where the Romans had large copper mines.
Native copper is often found in basalt rocks and in veins
that were once close to magma chambers. The shape of a piece of native copper reflects the deep underground fissures in which
it was originally deposited. The largest piece of native copper ever found was in Minesota Mine, Michigan. It weighed over
500 tonnes.
Cotton soil
(See: Vertisol.)
 Cross bedding – This occurs when one bed builds forwards and cuts across the top of an earlier one.
Current
Sand
 Copper – Copper ore.
Creep, soil
The gradual downhill, saw-tooth motion of a clay soil produced by the shrinking and swelling of clays as they get wet and dry out.
All clay soils shrink as they
dry out and swell as they become wet. During the course of a year this may happen many times as a result of alternating rainstorms and periods of dry weather. As the clay soils change shape, gravity causes them to move down a slope.
Soil creep is an extremely slow process. In the past some people have suggested that trees with curved trunks on steep slopes have been pulled over by soil creep. However, this has never been proven.
Cross-bedding
A pattern of deposits in a sedimentary rock in which many thin bands of sediment lie at an angle to the bedding planes. It indicates that the sediment was deposited by wind or flowing water (also called current bedding). The cross-beds deposited by wind are often bigger than those deposited by water.
Bed builds this way
Cross-bedding
15