Need answers fast
in the old west, a cowboy would put their ear on the railroad track to determine if a train was coming. using this method, they could tell if the train was coming sooner than just listening for the train.
a good explanation for this would be that
a)
sound and vibrations travel faster through gases than solids.
b)
sound and vibrations travel faster through solids than gases.
c)
sound and vibrations dissipate faster in solids than in liquids or gases.
d)
sound and vibrations are more concentrated in solids than in liquids or gases.

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes