Astream channel is formed when water
a) carves a narrow path into rock.
b) carries minerals into the ocean.
c) carves a very deep and wide channel into rock.
d) creates a depression, which forms a lake.

A stream channel is formed when water : A. a carves a narrow path into rock

A stream channel will constantly adjust to changes in stream flow, sediment load, stream slope, and vegetation until it form a path  for water and sediment flowing within the stream banks

hope this helps

Cause of he different elevations  hope this ?

Themes; subfields is the answer