Magma is a rock fused with gas, this liquid is found below the surface. Lava is the magma that reaches the surface. Lava is the molten rock that runs across the earth’s surface.
It is molten rock, it is the liquid that is found below the earth’s surface. It is composed of a combination of dissolved gases, rock fragments, crystals, and a molten mass.
It is created at high pressures and temperatures, so it is a very hot substance, its temperature ranges from 1,292 to 2,372 degrees Fahrenheit. This substance is found in chambers that feed volcanoes. It can also rise to the surface through nearby rocks or cause explosive ejections of tephra.
There are three types of magma:
Basalt: It is very low in silica and gas. It has a very low viscosity and is produced at high temperatures, around 1200 degrees Celsius. It is very common in volcanic fields and creates thin lava flows that form shields.
From Andesite: It occurs at temperatures below basalt, from 800 to 1000 degrees Celsius. It has a higher content of silica and gas and is moderately viscous. It is common in stratovolcanoes and produces mildly explosive eruptions. Create thick, debris-filled lava flows.
Rhyolite: It is produced at the lowest possible temperature, between 750 and 850 degrees Celsius. It is very rich in silica and gas, it is also very viscous. It is found in caldera volcanoes and creates highly explosive eruptions that cause pumice, ashfall, and pyroclastic flows. If it has a low gas content, the lava can flow.
It is the molten matter that a volcano expels during its eruption. When it solidifies, it forms volcanic rocks.
Volcanic eruptions occur due to the accumulation of magma. This is due to the fact that the gases are dissolved in the liquid rock and pass into the gaseous phase when the pressures are altered. The gas bubbles fill the magma and when trying to escape they generate high pressures that produce the volcanic eruption.
Lava has a temperature that ranges between 700ºC and 1,200ºC when it passes through the earth’s surface and as its temperature drops, it begins to solidify and form volcanic or igneous rocks.
Magma vs Lava
Difference between Magma and Lava
- Magma forms inside the Earth’s surface.
- Lava is magma that has reached the earth’s surface through a volcanic eruption or has escaped through rocks.
- Magma can have different viscosities.
- Lava is very viscous.
- Magma cools quickly and forms plutonic rocks.
- Lava cools more slowly and forms igneous rocks.