Fertilize the soil by shedding digestive material

The answer is earthworms.

Earthworms live in the soil where they feed on plant material. By eating and digesting plant material, they mix it with soil mineral components. Now, the organic matter is improved. It is then excreted into the soil becoming high-quality humus. This humus contains many mineral elements, such as nitrogen, phosphorus, calcium, magnesium, etc. Therefore, earthworms help fertilize the soil by shedding digestive material.

Earthworms help fertilize the soil by shedding digestive material. 

Characteristic expected of mineral from lava at earth's surface

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.

There would be no evaporation so no water cycle