In "S.O.S.", Bernard starts building an SOS sign from black rocks he found in a lava field 1/2 mile inland from the beach. The Island has igneous (volcanic) origins, like almost all islands in the Pacific, so it is composed in great part of a black volcanic rock called basalt.
Igneous rocks contain large proportions of metal elements such as iron and manganese. This gives the rocks magnetic properties which form anomalies in the earth's natural magnetic and gravitational field.
Lava-formed coastlines are also apparent in the rocky vistas seen in the following episodes:
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Lava is a hot substance that can be found in the Wilderness, Tzhaar City, Gu'Tanoth and various dungeons throughout Gielinor. It cannot be walked on and sometimes has smoke coming from it. It also cannot hurt the player.
More common, though, "Lava" is a combination of fire and earth.
Lava can also mean, or is commonly abbreviated, to the following:
Magma was the liquid state of rock when melted by some means. It was also known as lava when expelled from beneath the surface of a planet to the area above ground.
It was occasionally mined, such as on Mustafar.
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