They modified it buy cutting down trees and building factories and buildings in order to grow plants and fruits more effectively in a more precise inviorment!
20. is Memphis Tennessee
21. is Knoxville Tennessee
Measuring in light-years also allows astronomers to determine how far back in time they are viewing , Because light takes time to travel to our eyes. Everything we view during the dark in night has already been happened.
Answer:
The heat equation can be written as. ∂ u ∂ t = α ∇ 2 u. where u(x, y, t) is the temperature field that varies in space and time, and α is the thermal diffusivity constant.
