Errors - add numbers
Add this pair of numbers.
9+-3, 5+-1.
The uncertainity is:

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

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.

amplitude

hope this

friction

explanation:

they us to move forward and backwards