Question

Mercury, Venus, Earth and Mars are
collectively called​

Answer 1

Mercury, Venus, Earth and Mars are collectively called terrestrial planets.

Answer 2

Answer:

Inner planets and Terrestrial planets

They are inner planets because they are in the first four orbits around the sun and are close to it.

And they are terrestrial planets because they're made of solid rock surfaces compared to the gas giants like Jupiter and Saturn and ice giants like Uranus and Neptune.