Why is it so moist in a forest?

Answer 1

Around the equatorial regions there is nearly a constant convergence of low lever air. That converging air then rises into the atmosphere which allows for the production of plentiful rainfall over that region. This by extension contributes to the moisture content of the soil because the intricate root systems of the indigenous nouns hold the moisture.

Rainforests' soils are so moist because the air pressure at the equator is low. Air is sucked in from the oceans which contains moisture. Low air pressure also means that air rises upwards. As the strong overhead sun evaporates moisture from the forest, the damp air rises, cools and condenses, producing thunderclouds and rainfall on a daily basis. This process is known as convectional rainfall.