Answer: The layers of Earth are uniform in thickness
Earth's layers have different thicknesses and do not have a uniform average composition, being the crust (the outermost zone of the concentric structure of the geosphere and the layer in which we live) considered thinner with a variable thickness; from 5 km on the ocean floor, up to 70 km in the mountainous areas of the continents.
Therefore the statement "The layers of Earth are uniform in thickness" is false.