B) For the month of March in Lethbridge, the average high was 6.0°C and the average low was -6.5°C. For Halifax, the average high was 3.0°C and the average
low was - 5.8°C. Explain why the temperature changes more in one city than in the
other. /2

You get 6 for mechanical

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.