The silk road was named retractively in the 19th century what does retroactive mean

What was discussed at the yalta conference

Under the us constitution, some powers belong to the states. choose the power that belongs to the states.

Katie and her father are looking at the pipes around their house. they find that some of the pipes have rust on them, making them look and feel different than normal pipes. what kind of change have the rusted pipes gone through? a. a physical change b. a vibration change c. a chemical change d. a temperature change