During the past two-and-a-half years of traversing the central part of Gusev Crater, NASA’s Mars Exploration Rover Spirit has analyzed the brushed and ground-into surfaces of multiple rocks using the ...

Introduction -- Physical properties of magma -- Intrusion of magma -- Forms of igneous bodies -- Cooling of igneous bodies and other diffusion processes -- Classification of igneous rocks -- ...

THE closing years of the nineteenth century witnessed a revival of interest in the petrology of gneous rocks, which must be regarded as marking an important stage in the development of that subject.