The complete sentence is:
Long-term climatic cycles are climatic variations that are characterized by developing climatic changes over long periods of time.
For example, the current climate change has lasted for more than a hundred years, in which the temperature of the atmosphere has increased and this has triggered other climatic manifestations such as:
These processes typically take more than a lifetime because they are long-term processes that include small variations that result in large changes in climate and other aspects of the Earth.
Learn more about the weather in: https://brainly.com/question/885982