Question

Hardens to form new rock at mid-ocean ridges

Answer 1

The answer is magma. When underwater volcanoes erupt, they shoot out magma into the ocean. Sometimes, this magma hardens and forms islands.

Answer 2

Answer is: magma.

Magma is the molten natural material which form igneous rock (through the cooling and solidification of magma or lava).

Magma is found beneath the surface of the Earth.

Magma is composed mainly of silicon (Si), oxygen (O), aluminium (Al), iron (Fe), magnesium (Mg), calcium (Ca), sodium (Na) and potassium (K).