(Q).
If temperature changing can cause melting, then what can cause melting?  Answer choices: - Changing pressure  - Heat energy  - Water expanding  - Evaporation  - converting electricity to heat  - Increase in mass  - Temperature changing  - Chemical reaction
(A).
Temperature changing


(Q).
If wool can be used for keeping warm, then what can be used to keep warm?  Answer choices: - hair  - eating steak  - wool  - fibers  - hats  - catching lobster  - fueling cars  - fur
(A).
wool


(Q).
If activation energy must be used before a chemical change happens, then what is required before a chemical change?  Answer choices: - kinetic energy  - energy usage  - activation push  - activation energy  - activation switch  - activation power  - Burning fuel and air  - Evaporation
(A).

activation energy