An unknown element has an atomic number of 44. Identify the element’s symbol and the symbols of two other elements that have similar properties.

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Sound is a disturbance that travels through a medium as a