I would assume because it is the third closest planet to the Sun?
Because, counting out from the Sun, Earth is #3. Also, a lot of the planet is made of rock.
I think it is called Igneous Rock.
The Earth, because it is a rocky planet and it's the third planet away from the Sun.
i think water,fire,earth,and ice
Earth is.
Lava
The Earth is known as the third rock from the sun, since it is the third planet in orbit from the sun.
its the core. Its in the center of the earth and thatis where we get our geothermal enery
Melted rock beneath the earth is called magma.
It's the Earth
Earth, third rock from Sol.
Molten rock is called magma when it is inside the earth. Its called lava when it reaches the Earth's surface.