First a tractor sprays nearly 20 tonnes of gray crushed basalt over one field. Then the farmer makes several more passes spreading other material in different combinations: bone-white limestone ...

If magma erupts on the surface as lava, it will form extrusive rock, e.g. basalt. These rocks are formed when magma solidifies. As the magma cools, mineral crystals will begin to grow. These ...

The presence of plentiful microbial life in basalt rocks formed in ancient times in ocean depths, where energy sources such as light and hot water--key ingredients to sustain life are scarce ...