In the north the ground becomes very cold as the winter snow and ice covers the ground.
在北方地面变得很冷，因为冬天的冰雪覆盖着地面。
《柯林斯英汉双解大词典》
2
Most of the Arctic is covered in snow and ice, which are highly reflective; if snow and ice melt, the exposed soil, which absorbs heat, serves to accelerate warming.
北极大部分地区被冰雪覆盖，具有很强的反射性；如果冰雪融化，裸露的土壤吸收热量，有助于加速变暖。
3
When they detect snow or ice on their surfaces, the roads will heat themselves up, melting the snow or ice away.