TRANSVERSE CONTRACTION JOINTS. The primary purpose of transverse contraction joints is to control the cracking that results from the tensile and bending stresses in concrete slabs caused by the cement hydration process, traffic loadings, and the environment.
Diamonds are found in igneous rock which is brought to the surface of the earth by volcanic eruptions bringing magma to the surface. Diamond itself is strictly an allotrope of the element carbon, a mineral, one form of crystal that can be created from carbon.
igneous = fire rocks. igneous rock (made from hot, melted rock) Igneous rocks form when melted rock, or magma cools and hardens. Sometimes the igneous rocks form in the ground (intrusive igneous rocks), and sometimes they form outside of the ground (extrusive igneous rocks).