6. Changing a SOLID to a LIQUID to a GAS requires

Energy (latent heat)

Explanation:

Latent heat of fusion for solid to liquid

Latent heat of vaporization for liquid to gas.

it requires the present of heat

Explanation:

when there is heat the solid will melt into liquid and from liquid when it is heated for example when water is heated it evaporate into vapor which is gas

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.