sentences:  Fog drip is a key to the rich diversity of species in the San Pedro Valley, most likely providing up to one-third of the annual available moisture in this ecosystem and keeping the cool, clear forks of San Pedro Creek running all year.Montara Mountain and Sweeney Ridge are not cloaked in the dense Coast Redwood ("Sequoia sempervirens") and Coast Douglas-fir ("Pseudotsuga menziesii var.menziesii") typical of the rest of the Santa Cruz Mountains to the immediate south.