凍てつく

Above; on top of; up.

On top of, above, upon.

Abundant; rich; plentiful (na-adjective).

According to, in conformity with, as (something happens).

Acid rain.

Activity; daily life; undertaking (e.g., life's activities).

To adapt; to adjust; to conform.

Against the backdrop of; with...as background.

air

Air pollution; the presence of harmful substances in the air.