Answer:
the two groups of planets based on composition;
1.Terrestrial planets.Mercury ,Venus ,Earth and Mars are terrestrial planets.It is also called inner planets.
- a terrestrial planet is a celestial body that is
composed primarily of silicate rocks or metals.
- It has a solid surface.
- They are primarily composed of gases like hydrogen and helium, water, and some heavier elements .
2.Jovian planets.Jupiter, Saturn, Uranus and Neptune collectively are known as the jovian planets. It is also called outer planets.
- planets.Jupiter, Saturn, Uranus and Neptune collectively are known as the jovian planets. It is also called outer planets.they have relatively small, dense cores surrounded by massive layers of gas.
- it is made almost entirely of hydrogen and helium, .
- these planets do not have solid surfaces.