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Geological analysis relies mainly on chemistry, physics and mathematics. a'a' lava - basaltic lava characterized by a rough or rubbly surface composed of broken lava blocks called clinker.
Complex, sometimes contradictory geologic theories to explain this desolate Mars environment have been proposed, based on a wide variety of observed surface phenomena and features.
Geology is the scientific study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them.
The Greek derivation of the word "geology" refers only to the Earth, but since the beginning of the space age, the field has expanded to include the study of the solid matter of other celestial bodies, such as Mars and the Moon.
A new model that reconciles major puzzling contradictions among past models is now put forth, using new observations from MGS high-resolution images of Mars and a reevaluation of certain Viking era experiments.
Small-scale surface features are identified which, it is proposed, are the direct product of wide spread ancient and recent bursts of subsurface liquid water.