As land masses move and mountains grow or are eroded away over geological time, they cause very slow and long-term changes in climatic patterns. For example, the location and size of land masses influence the distribution and intensity of surface heat absorption and reflection, which cause high and low pressure systems and give rise to wind movement. The location, orientation and height of mountains affect air circulation and cloud formation, and rainfall distribution patterns.
It must be remembered that the rate of these geological processes is very slow, and measured in millions of years. Continental plates drift at between 1 and 10 centimetres per year; the Himalayas are growing at around 5 millimetres per year.
W. J. Kious and R. I. Tilling, This dynamic earth—the story of plate tectonics, US Geological Survey, 1996.