Calculate the following question

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

How much energy is made when a pice of wood burns. how do you know

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.