What happens during a physical change? A. New substances are formed
B. The identity of the substance is changed
C. A chemical reaction occurs
D. A substance may look different, but has not changed its identity.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

How does the motion of particles in a gas change as the gas cools