Awave which needs a medium (solid, liquid, gas) in order to propagate itself.

Any 'mechanical' wave needs a medium in order to travel from one place to another.

Examples of mechanical waves include . . .

-- ocean waves

-- sound waves

-- Slinky waves

-- guitar-string waves

-- hand waves

-- curtain waves

-- ripples on a pond

-- seismic waves (earthquakes)

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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