what most likely caused the ice ages?\n the size of tree rings and the amount of pollen grains\n solar…

what most likely caused the ice ages?\n the size of tree rings and the amount of pollen grains\n solar flares and gassy ejections from the sun\n the tilt of the earths axis and the shape of its orbit\n the temperatures of the sun and moon

what most likely caused the ice ages?\n the size of tree rings and the amount of pollen grains\n solar flares and gassy ejections from the sun\n the tilt of the earths axis and the shape of its orbit\n the temperatures of the sun and moon

Answer

Explanation:

Step1: Analyze option 1

Tree - ring size and pollen grains are indicators of past climate but not causes of ice - ages.

Step2: Analyze option 2

Solar flares and gassy ejections affect Earth's upper atmosphere and magnetic field, not directly related to ice - ages.

Step3: Analyze option 3

The tilt of the Earth's axis (obliquity) and the shape of its orbit (eccentricity) are Milankovitch cycles. These cycles change the amount and distribution of solar radiation received on Earth over long periods, which can trigger ice - ages.

Step4: Analyze option 4

The temperature of the moon has no significant impact on Earth's ice - ages, and the Sun's temperature changes very slowly on long timescales and is not the main cause of ice - ages.

Answer: the tilt of the Earth's axis and the shape of its orbit