What is the outer core of the Earth made primarily of?

It is mostly made of  liquid iron and nickel.

Explanation:

The outer core is mostly made of out liquid iron and nickel. It is very hot and it can reach up to between 4,500° and 5,500° Celsius, (8,132° and 9,932° Fahrenheit). It is about 2,200 kilometres (1,367 miles) thick!

Note: There isn't anything to explain.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.