Question

Why are the outer planets sometimes called gas giants?

A) The outer planets are called gas giants because they have volcanos that give off gas.

B) The outer planets are called gas giants because they are named after giant beings from Greek mythology.

C) The outer planets are often called gas giants because they are very large and emit gases from their cores.

D) The outer planets are often called gas giants because they are composed almost entirely of gas and are much larger than any of the four inner planets.

Answer 1

Answer: D

Step-by-step explanation:

A gas giant is a large planet mostly composed of helium and/or hydrogen. These planets, like Jupiter and Saturn in our solar system, don't have hard surfaces and instead have swirling gases around a solid core. They are called Gas Giants because they are composed mostly of gas and because they are gigantic in size, compared to the smaller inner planets, which are nicknamed the "rocky planets".