(Q).
Burning wood is used to produce heat, and heat is added and the temperature of the water increases. Given these facts, what is used to increase temperature among the following options: - activation energy - ice - electricity - snow - glaciers - burning wood - Electrical energy - Fuel cells
(A).
burning wood

(Q).
Mammals can also generate little bursts of heat by shivering, and an inability to shiver or react to the cold can contribute to hypothermia. Given these facts, mammals can also generate little bursts of heat by what among the following options: - the body's largest organ - reacting to the cold - flow of electrons - looking very cold - reacting to the news - considering being warm - Movement of an air mass - with their fur
(A).
reacting to the cold

(Q).
Adding salt to a liquid decreases the melting point of that liquid, and impurities like salts would also help by lowering the melting point. Given these facts, what decreases the melting point of liquid among the following options: - Dilution - Impurities - Water expanding - Dehydration - Heat energy - Pollution - Time and energy - evaporation
(A).
Impurities