The eruptive process that affected the north of the island few thousands years ago (from 3 to 5 millennia) also corresponds to a fissure mechanism of some few emission centers distributed though 5 km. It is the normal type of eruption in the Canary Islands, the same as the chemical composition of the lava that corresponds to a basaltic mineral (green vitriol).

These eruptions usually have two exit holes: one from where the lava goes out which usually are external cracks; and other, from where the gases together with the ashes, bombs, and another projection materials get out.

The volcano of La Corona, arisen with a little more than 200 m. high from the platform of Guatifay. N ext to the cliff of Famara it culminates together with 609 m. on the sea level. It has a diameter of 1,100 m. on the base and 450 m. in the highest part. The bottom of the crater has 190 m. depression from the superior borders.

The plutonic activity of this volcano modifies substantially the orography ofthe island. The lava ejected in different directions and the eruption would have been one of the most spectacular on Lanzarote. The crater is formed by scum and sticky lava thrown in successive explosions with moderate intensity.

The lava fused the material s through the slope. Also it built a deep channel that when the upper part solidified, a cover was made up with a group of volcanic tunnels that extend up to 7 km long from the emerging volcano until penetrating in the sea about 2 kms. in form of submarine cave.

The volcanic tuff of section and moderate longitude are frequent in Canary. But it is in Lanzarote where these tuffs have extraordinary dimensions (La Cueva de los Naturalistas and La Cueva de los Verdes). As far as dimensions are concerned a similar formation doesn't exist in the rest of the planet.

Lichens and tabaibas (auphorbia) are the predominant vegetation. Some specific vegetable species from this sand-bank live in some deposits of sand located in the coast, as the balancón (Traganum moquinii) and the lecheruela (euphorbia paralias linneo) among others.

The wildlife is similar to that found on the rest of the island, although it is to stand out the one that has its habitat inside the Jameos del Agua.