A hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time. What type of heat transfer is this?

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

there is none because earth is stationary and flat.