Question

which phrase describes a plateau?
low elevation
surface cut by streams
rounded or sharp peaks
gradual slopes on all sides

Explanation:

A plateau is a flat - topped landform with relatively high elevation and gradual slopes on its sides. "Low elevation" is incorrect as plateaus are at relatively high elevations. "Surface cut by streams" is more characteristic of areas like floodplains or dissected plateaus (but not the defining feature of a general plateau). "Rounded or sharp peaks" describe mountains. So the phrase that describes a plateau is "gradual slopes on all sides".

Answer:

gradual slopes on all sides