Scientists have correlated average global temperature with atmospheric carbon dioxide levels for the last 160,000 years using ice cores from Antarctica. How is the carbon dioxide level determined?A. by measuring the CO2 concentration in trapped gases in the ice layers
B. by measuring the 18O/16O ratio in the CO2 molecules
C. by extrapolating the CO2 level from the temperature of the ice
D. by extrapolating the CO2 level from the average global temperature

A. by measuring the CO2 concentration in trapped gases in the ice layers

Explanation:

By looking at past concentrations of greenhouse gasses in layers in ice cores, scientists can calculate how modern amounts of carbon dioxide and methane compare to those of the past, and, then, compare past concentrations of greenhouse gasses to temperature.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.