The four distant planets are made mostly of

a. radiation

b. gas

c. rock

d. water

The four outermost planets are Jupiter, Saturn, Uranus and Neptune.

Jupiter is a gas giant, which means it's made of gas and dust helming together by Jupiter's gravity.

Saturn is also a gas giant.

Neptune and Uranus are also gas giants, but included with the dust and rocks making up their surface, they also have a lot of ice, because they are so far from the sun.

The correct answer is B, gas.

Three reasons of the deaths of native americans: new illnesses that their immune systems couldn't cope with. genocides so the settlers could have the good land.starvation from lack of rations and poor infertile land on resevations