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Later in 1875 he took into account obliquity (tilt of the axis) cycle (Davis, 2002).

Milankovitch, being a mathematician, took Croll's work and set out to develop a mathematical theory of climate change.

In addition to the actual age of the ice at any given depth in the core, scientists can also determine the mean temperature of the Earth's past climate for different times and ages by measuring the ratio of the isotopes of oxygen (O16 and O18) gas present in the CO2.

These three elements that have cyclic variations are eccentricity, obliquity, and precession.

Dogs eat both meat and vegetables, often mixed together and sold in stores as dog food.

Dogs often have jobs, including as police dogs, army dogs, assistance dogs, fire dogs, messenger dogs, hunting dogs, herding dogs, or rescue dogs.

In 1949 Radio Carbon dating was developed allowing the age of bones or organic artifacts to be determined accurately.

The accuracy varies from 1.4% for samples 3000 years old, to 10% for samples 40000 years of age.