<span>D. Convection occurs when heated particles of a material flow toward areas having less thermal energy. This movement of particles can only occur in gases and liquids, not solids.</span>
The answer is C. in sort of a way. You can't technically see black matter. However, it is holding the galaxies together.
The electrical symbols are very important especially when fixing electrical appliances because it tells you where the wire of neutral and live go.
As the speed of airplane is change due to jet stream
So the net speed is given as

now we can rearrange it as

now by the formula of vector difference we have

now plug in all values
![v_{plane} = \sqrt{365^2 + 136.73^2 - 2* 365* 136.73*cos22}[tex]v_{plane} = 243.7 km/hr](https://tex.z-dn.net/?f=v_%7Bplane%7D%20%3D%20%5Csqrt%7B365%5E2%20%2B%20136.73%5E2%20-%202%2A%20365%2A%20136.73%2Acos22%7D%3C%2Fp%3E%3Cp%3E%5Btex%5Dv_%7Bplane%7D%20%3D%20243.7%20km%2Fhr)
so above is the speed of the plane
I think the main idea is that the middle planets have a solid inner core and that they all could have life on them