These are the least severe type of burn, affecting only the outer layer of skin.

UVB rays affect the outer layer of the skin and can cause sunburns.

It affects only the outer layer of the skin.

He added that the cracks affected only the top layer of concrete and did not pose a structural problem.

First-degree burns affect only the outer layer of the skin.

Most studies of Langmuir cells have focused on their effect in open ocean, where the vortexes affect only the top layer of water.

Most changes affect only the layer in which they're made, with few side-effects that impact other layers.

But most astronomers now say that the explosions were too shallow to affect the ice-cloud layer of Jupiter.

These observations indicate that whatever process forms the streaks, it affects only the very thinnest layer at the surface.

In this mode, certain modulation sources can affect all layers in a program instead of just affecting the current layer.