Explain the movement of magma within the Earth's crust?

Answer 1

Magma is liquid and lighter in weight than the crust. Because it is less dense, it forces its way upwards. It probably also melts its way somewhat. It will seek the avenue of least resistance and this is generally cracks and faults. The mantle is not made of magma per se. It is actually very plastic solid. At divergent boundaries, the magma is not really moving within the crust but between the plates. They solidfy as the two plates spread. Magma at subduction zones is a better example. Here, material is pushed down into the mantle. The volatile rich magma forms since the water lowers its melting point. It then rises to the surface since it is less dense.

Answer 2

Within the earth's crust, magma, like any liquid, will flow to the point of least resistance: where the crust is the very thinnest. When the pressure of the magma overcomes the strength of the crust, it erupts, and a volcano is formed.

Once you move deeper, magma is free to flow, and creates the "sea" of magma on which our tectonic plates "float".

Answer 3

Divergent boundaries occur along spreading centers where plates are moving apart and new crust is created by magma pushing up from the mantle. Picture two giant conveyor belts, facing each other but slowly moving in opposite directions as they transport newly formed oceanic crust away from the ridge crest.

Answer 4

magma outflux towards centre of divergent margin(mid oceanic ridge) is the result of 2 most important factors.first one is buoyancy being as liquid and second one is zone through which it moves upward.Along divergent margin presence of less pressure and stress enables the pathway for magma and due to large mass buoynacy force overcomes gravity force.Temperature and viscosity are factors which alos play important role.Lesser viscosity due to higher temeprature helps in upward movement .