Igneous outter
Magma that reaches the earth's surface, out through cracks or holes as the eruption of volcano lava, it cools rapidly and freezes into extrusive rocks. The exit of magma in the earth's surface through a linear fracture or fissure eruption called Eruption. In general, lowviscosity basaltic magma can flow around rekahannya, a stretch of basalt lava, calledbasalt plateau.
While coming out through a hole called the eruption of a volcano crater central. Magmacan flow through the slope, as lava flows or join up with the ejected gases as pyroclastic, orspice volcano. In the air immediately frozen while still incandescent.
Lava contained in various forms and types, depending on the composition magmanya and place or environment where pembekuannya happen.
When magma solidifies below the surface of the water formed pillow lavas, so named because frozen under the pressure of water above it looks like a pillow.The front of the rounded shape and accumulated flow overlapping, As well as in igneous, igneous outter is also present in several types, namely rhyolite anddacite, andesite, basalt and various pyroclastic rocks. In Classification of Frozen Rocks,including the rock group afanitik.
The fact that the rate of cooling of magma affect the grain size can be used as a simple way to distinguish igneous rocks frozen in from the outside. When igneous rocks showcoarse grains (coarse grains), the rocks are intrusive rocks. And conversely, if the fine-grained (fine grains) the extrusive rocks.
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