Walls of land built to hold back water are known as

They are called dams. Hope it helps!

i didn’t understand your question but archipelagos are groups of island hope this

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.