The network of pores within the soil aerates, or ventilates, the soil. This aerates soils and stimulates heterotrophic growth and production. Next, the cultivator adds nutrients and possibly aerates the result. It aerates the milk, creating a thick and heavy foam. He then guards them, aerates them and chases away intruders. After eggs are laid, the male aerates them by picking them up in his mouth. The male guards and aerates the eggs for 6 to 7 days until they hatch. Once the eggs are laid, the male guards and aerates the eggs until they hatch. Sometimes basalt aerates into reticulite, the lowest density rock type on earth.