Complete the sentences below to describe the demographics in Sub-Saharan Africa. The average age of the population is than fifteen. The fertility rate is than that of most other nations.

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.

Ibelieve this is true m8

D. a mountain abd are made by volcanos and tectonic plates