The isotopic composition of carbon in iron formations ... found in the Saglek-Hebron chemical sedimentary rocks are in fact "abiotic," that is, nonliving physical or chemical aspects of an ...

The basalt which makes up the Giant’s causeway is an igneous rock. Sedimentary rocks are formed by small rock pieces which are transported by rivers and laid down in layers. Chalk is a ...

Identification, physical properties, chemical composition, occurrence, and origin of the important types of igneous, sedimentary, and metamorphic rocks. Laboratory includes hand specimen description ...