Which is an example of physical weathering? a- limestone in rock dissolving when acid rain flows across it

b- bits of rock rusting when exposed to oxygen and water

c- wind blowing off bits of a rock over time

d- oxidation of certain metals in rock

The goal of this experiment was to answer the question, "how does diffraction occur? " suppose you formulated this alternate hypothesis: if the gap width is increased while keeping wavelength constant, then the observed diffraction will decrease because the less the ratio between wavelength and gap width is, the smaller the observed diffraction angle will be. to test this hypothesis, you would change the  gap widthdiffraction anglewavelength  and observe the  gap widthdiffraction anglewavelength  in the system. therefore, the independent variable would be the  gap widthdiffraction anglewavelength  and the dependent variable would be the  gap widthdiffraction anglewavelength.

Low areas cut into a gun barrel are called

Afrog sits on a lily pad in the middle of a pond. suddenly it makes a leap pushing off lily pad. what’s the action and reaction?