Terribly worded question, but yes the Earth has a liquid outer core and a solid iron inner core.
No, Earth is not the only planet with lava (magma), Venus has a molten core as well as Earth.
Mars
The Earth's inner core is increasing in size as the planet cools.
Mercury is slightly smaller then the Earths Core. Mercury is believed to have been struck by a planet sized object billions of years ago which blew away everything but the core of the planet.(If Pluto was still a planet, Pluto would also be smaller than the Earth's core, but it was demoted to the status of a dwarf planet.)
The core. The heart of the planet is called the core, Earth's core is molten while some other planets have solid cores.
Earth
We are ON, not in, the 3rd planet from the sun. Usually called Earth.
Because it is the innermost part of the planet.
A barysphere is the central core of the Earth or any similar planet.
The important core concept is to "fulfill the needs" of your market at a profit.
They both have an iron core, and they have the same density.
The heat of Earth's core comes from a combination of residual heat of Earth's formation, the decay of radioactive isotopes, and possible fission of uranium at the planet's center.