A certain concentration of water in the air is needed for the reactions that cause wood to decay. Some timbers from Hopi pueblos have been preserved
for hundreds of years in the high desert.
However, a rowboat abandoned on a beach can rot away in just a few years.
Review the information in the data table. What can you conclude about the
rates of these reactions?
Object
Location
Decay time
Average
concentration of
water in the air
Arizona desert
Very low
Pueblo roof
beam
1,000 years or
more
Wooden rowboat Oregon beach
High
5 to 10 years

a coal burning power plant

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me