Why has the canals in Venice Italy cleared up during this time?

How do scientists think that gravity affected the formation of our solar system?

How much energy is made when a pice of wood burns. how do you know

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this