Magma: a rock that is melted or partially melted. When magma is ejected from the earth's surface, it is called lava. Magma generally consists of the following parts:
1. liquid formed by melting.
2. crystalline minerals from liquids.
3. xenoliths and inclusions.
4. dissolved gases in magma.
Lava: lava is a lava that flows out of the earth's surface. It is also used to indicate the formation of lava after cooling. The mobility of lava in molten state decreases with the increase of silica, the viscosity of basic lava is small and easy to flow, and acidic lava is not easy to flow. Because of the difference of the chemical composition of the lava or the difference of the volcanic environment, there are many forms of expression.
Lava flow is liquid in the surface flow of lava is called lava flow, lava flow cooling after the formation of solid rock accumulation is sometimes called lava flow. Liquid flow of lava temperature is often 900 degrees to 1200 degrees C, such as lava in the gas content, the lower the temperature can flow. Acid lava is sticky, flow is not far, a large area of lava flow is often basic lava. When the temperature is high and the slope is steep, the flow rate of lava flows up to 65 kilometers per hour.
The shapes of lava flow depending on multiple aspects, such as lava compositions (basalt, Anshan rock, dacite rock, rhyolite), flow, terrain and the environment.
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