What was one feature of the Earth that contributed to the runaway freeze 750 million years

What was one feature of the Earth that contributed to the runaway freeze 750 million years ago？

A．Carbon-dioxide levels in the oceans were low.

B．The continents were located close to the equator.

C．The movement of glaciers carried away large quantities of rock.

D．The level of greenhouse gases in the atmosphere was high.

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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