* Contact forces require direct physical contact between objects. Examples include pushing, pulling, friction, and the normal force.

* Magmatic forces are driven by the movement of molten rock (magma) deep within the Earth's crust. This movement is primarily driven by convection – the transfer of heat through the movement of fluids (magma in this case).

Here's how magmatic forces work:

1. Heat: The Earth's internal heat creates temperature differences in the mantle.

2. Convection: Hotter, less dense magma rises, while cooler, denser magma sinks, creating a circular flow.

3. Pressure: This movement of magma exerts pressure on the surrounding rock, causing it to deform, fracture, and potentially uplift.

In essence, magmatic forces are a result of pressure and heat transfer, not direct physical contact. They are examples of non-contact forces, which act over a distance.