Quaking trees, also known as Aspens (6 letters), are deciduous trees that are native to cold climates in the Northern Hemisphere. They are characterized by their trembling leaves and their white bark. The leaves of quaking trees are oval-shaped and have a flattened petiole, which allows them to tremble in the wind. Quaking trees are also known for their shallow root systems, which can cause them to topple over in strong winds.