Properties of basalt geological environment.. knowledge of the magnetic field the expansion rate of the ocean floor and the multiplicity of physical properties. Craters and cracks volcanic basalt magma coming out

Properties of basalt: 

Is the magnetic properties of basalt rocks the main factor in the current knowledge of the magnetic field of the old and the expansion rate of the ocean floor. And multiple physical properties of basalt rocks due to the multiplicity of tissue components. 

Geological environment of the Basalt: 

Consists of basalt on the surface close to the volcanic craters and cracks that come out of basaltic magma.