Final answer:
Igneous rocks are formed from the cooling and solidification of molten rock, either as magma below the surface resulting in a coarse texture, or as lava on the surface creating a fine-grained texture.
Step-by-step explanation:
The type of rock formed from cooling molten rock is igneous rock. Igneous rocks are one of the three main types of rocks found on Earth, the others being sedimentary and metamorphic rocks. These rocks form as magma (below the Earth's surface) or lava (at the Earth's surface) cools and solidifies. For instance, when magma cools slowly underground, the resulting igneous rocks, such as granite, are considered intrusive or plutonic and have a coarse-grained texture. Conversely, when lava cools rapidly on the Earth's surface, it forms extrusive or volcanic igneous rocks like basalt, which tend to have a finer-grained texture.
Igneous rocks are formed from cooling molten rock. When magma or lava cools and solidifies, minerals start to crystallize and interlock with each other, forming igneous rocks. Igneous rocks can have different textures and compositions depending on the cooling rate of the magma or lava.