I NEED HELP! I DON'T UNDERSTAND THIS QUESTION! There are three different ways in which the Earth's orbit changes through time. What combination of orbital parameters would be most likely to start an ice age? (Hint: Ice ages require cool northern summers.)

So you need to understand that the earth's orbit does change with time consisting of eccentricity.

Eccentricity is the deviation from circularity.

This leads to an axial tilt and precession.

The precession for your understanding is the motion of the axis of a spinning bodyso consider a tabletop spinner as an example.

All of this together creates solar radiation that reaches the earth's surface. This cycle is the Milankovitch cycle which describes the total effects of changes in the Earth's movements on its climate over the years we have had.

SO, when the earth is titled toward the northern hemisphere we can say that winter and a summer solstice will concur with aphelion and perihelion.

To understand what that means you need to know that

Perihelion - [This is the point closest to the sun in the path of a body that orbits such as a planet].

Aphelion - [This is the opposite of Aphelion. Meaning it is the furthest.]

These are the required parameters for an ice age. Although unlikely, this is what would be required.

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