Question

data table: estimated arctic fire activity
which variable in the table represents a form of matter being cycled into the atmosphere?
temperature
area burned
carbon released
year

Explanation:

Carbon is a form of matter. When there is a fire (as in the context of Arctic fire activity), carbon is released (e.g., as carbon - based gases like carbon dioxide) into the atmosphere. Temperature is a measure of thermal energy, area burned is a measure of land affected, and year is a measure of time. None of these (temperature, area burned, year) are forms of matter being cycled into the atmosphere.

Answer:

Carbon released