Answer:Phase change materials (PCM) are substances that absorb and release thermal energy during the process of melting and freezing
Explanation: when it cools it changes like ice melting
Answer:
compact theory in the united states. regarding the constitution of united states, the compact theory holds that the country was formed through a compact agreed upon by all states, and that the federal government is thus a creation of the states
Trading of goods. For example on the southwest coast of British Columbia the indigenous people had a trading network expanding a great deal inland and even more so southward and northward.
The Olympic stadium was converted into a football stadium for the Atlanta Falcons.
