Rank the three most common types of radiation in order of increasing penetration power

They would be:

Alpha - these are fast moving helium atoms.

Beta - these are fast moving electrons.

Gamma - these are photons, just like light, except of much higher energy, typically from several keV to several MeV.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

im not exactly sure but i think its b!