Какую степень окисления проявляют галогены в природных соединениях? Каким образом можно получить фтор? Каким образом

The habitat of polar bears is the North Pole.

Soil pollution is caused by the presence of man-made waste.

When you smoke, you cause air pollution.

Water pollution is caused by factories.

Toxic fumes are poisonous gases that are dangerous for human.

Factory waste causes water pollution.

Water pollution is harmful for fish.

Water pollution makes fish wipe out.

Atmosphere is polluted by air pollution.

It's dangerous for human to breathe toxic fumes.

Burning plastic emits toxic fumes.

Acid rain is rain that has been made acidic by certain pollutants in the air.