Angie's house is cold during the winter. she starts a fire in the fireplace to keep the house warm.

how is heat being produced?
a.
by rubbing
b.
by electricity
c.
by burning
d.
by all of these

Need on both questionswill markbr />

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

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?