Complete the sentences that describe the distribution of earthquakes around the world by matching the phrases. 1. Most earthquakes occur
2. The largest earthquakes occur
3. Most earthquakes
4. Deep earthquakes are

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

Answermongolia;

Answer (b) they're often rural migrants with no title to housing or rights to established businesses