Mountains are a geographical feature found in many biomes. the rain shadow effect is where

Mountains generally act as the headwaters of rivers. Clouds moving along a weather frontal system are advected to a higher altitude when they encounter mountains, causing condensation and rainfall. Unfortunately, in most parts of the world, weather patterns follow a common direction most of the time. Therefore, when the clouds encounter the mountain range, it is usually from one direction. This results in the majority of rainfall falling only on one side of the mountain, and the mountain acting as a barrier preventing cloud systems from carrying moisture across the mountain.

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass