A kind of rock that is formed when melted rock cools and hardens is ?

I think the answer you are looking for is igneous rock. Here is a site that explains how the three different kinds are formed.

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EASY FOR ME! Ok,ignous rock. I'm in 4th grade and I remember! YAY!

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The kind of rock that is formed when melted rock cools and hardens is called igneous rock.

To arrive at this answer, you can use the following steps:

1. Start by understanding the process of rock formation. Rocks can be formed through different processes, such as cooling and hardening of melted rock, pressure and heat, or accumulation of sediments over time. In this case, we are looking for a rock formed by the cooling and hardening of melted rock.

2. Recall the term "igneous." Igneous rock is one of the three main types of rocks, along with sedimentary and metamorphic rock. The word "igneous" derives from the Latin word "ignis," meaning "fire," which refers to the fact that igneous rocks are formed from molten or melted rock (magma or lava).

3. Apply your knowledge to the question. Given that we are looking for a rock formed when melted rock cools and hardens, the term that fits this description is "igneous rock." It is formed when magma or lava (molten rock) cools down and solidifies, either on the surface (extrusive igneous rock) or in the depth of the Earth's interior (intrusive igneous rock).