Two processes are described below: Process A: Rapid moving water strikes a rock on the bottom of a stream and breaks it into pieces
Process B: Glaciers moving along a rocky surface form cracks in the rocks

Which statement is true about the processes? (5 points)

a
Both represent physical weathering.

b
Both represent chemical weathering.

c
Process A is physical weathering and Process B is chemical weathering.

d
Process A is chemical weathering and Process B is physical weathering.

Answer A

THis is weathering since rocks are rocky surfaces are getting worn out. And we can assume that the water and glaciers use no chemicals to break these things down just physical force. Hope this helps!

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.