Which of the following best illustrates a natural process acting as a constructive force? A.
A river eroding soil during a flood.
B.
A glacier weathering a mountainside.
C.
Wind depositing sand to build up sand dunes.
D.
Acid rain breaking down the surface of a rock.

Can someone me with these questions plz.

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?

Use the de broglie's wave equation to find the wavelength of an electron moving at 4.5 × 106 m/s. show your work. note: h= plank's constant (6.62607 x 10-34 j s)