Achild sits on a partially filled balloon and decreases the volume by half. what happens to the pressure inside of the balloon?
a. it increases
b. it decreases
c. it stays the same

a.It increases

Explanation:

Lets take

Initial pressure =P₁

Initial volume = V₁

Final pressure =P₂

Final volume = V₂

If we consider that temperature of the gas which filled inside the balloon is constant.

We know that ,at constant temperature

P₁V₁ = P₂V₂

Given that

P₂ = 2 P₁

Therefore the pressure inside the balloon will become double.

Therefor the answer will be a.

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.