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Earth's Orbit and Climatic Change 
Earth's OrbitEarth's orbit can effect our climate since it's path around the sun is elliptical. The further it moves from the sun the colder it gets. The closer it moves towards the sun the warmer it gets.Climate Change (Global Warming): is a  process by which the Earths' atmosphere is changing over a period of time. Some of the causes are; to the build up of green house gases, the Earths orbit, variations in solar activity, plate tectonics, volcanoes, deforestation and lastly human activity.
Climate  is
the prevailing weather conditions (winds, temperature, air pressure, humidity, rain, sunshine, and cloudiness) of a region or the earth over a long period of time i.e. decades, centuries and longer periods of time. Weather on the other hand is the condition of a region or Earth over a short period of time such as days or weeks.
Geography Global Warmin Climate Change Science Glossary Weather
Geography Climate Change Science Glossary Weather
Online Books
Milankovitch Looking at Weather and the Seasons
Earth's Evolving System A Chronological History of Weather and Seasons
Resources Seasons Milankovitch
UNISCi Wikipedia Milankovitch Cycle
NOAA HowStuffWorks Paleoclimate
Natural NASA Wikipedia
Glacial Cycles NOAA
Physics Forum Science for Ohio Climate Change
PBS Teacher Weather Out Reach Science Course
NASA Apethelion.. Weather Questions Malankovitch Cycles
NASA Fact Sheet Window To the Universe Way Back Machine Google Scholarly Articles