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The formation of volcanic
Although the world distribution of a large number of volcanoes, but to the formation of a volcano may not be so easy! Here is a list of the volcanic formation of the four necessary conditions, and are indispensable, otherwise the copies may only look on in despair
The existence of the fragile surface of the earth's crust with ︰
In the previous chapter we mentioned the plate movement, and volcanic activity and plate movement are inseparable. Subduction plate expansion and the role of the magma associated with the emergence of the activities of these magma to create a beautiful volcano. The formation of the volcanic section occurred mainly in the expansion of the transfer and the crust cracks, the this part, we will not repeat, those who forget, get back to the previous chapter study to study it!
Letter to the depths of magma generation have ︰
Needless to say this, as we all know. If there is no magma, then how could it have volcanoes!
Stock crust in magma Department ︰
The existence of magma is necessary, but if there is not a certain amount of magma is still insufficient to provide a large number of volcanic magma eruption, therefore, only the existence of magma database to determine the occurrence of volcanoes. As magma and magmatic characteristics of the Treasury, we will detail later.
- 1 0 年前
general liability 普通義務
ground level 地平線,地平面,基級