Evolution of Earth's Atmosphere

Front

Atmosphere II contained mostly water vapor, carbon dioxide, and nitrogen.

Back

Front

Most water vapor in Atmosphere II condensed into oceans, forming carbonate rocks.

Back

Front

Nitrogen became the main component of Atmosphere III.

Back

Front

Ultraviolet light split water vapor into hydrogen and oxygen in Atmosphere III.

Back

Front

Stratospheric ozone layer formation.

Back

Oxygen in the atmosphere formed the stratospheric ozone layer, protecting life from ultraviolet radiation.

Front

Earth's atmosphere I composition.

Back

Composed of hydrogen and helium, which rapidly escaped into space.

Front

Atmosphere II characteristics.

Back

Included volcanic activity, producing water vapor, carbon dioxide, and nitrogen.

Front

Changes in gas concentrations over time.

Back

Earth's atmosphere experienced dramatic changes in gas concentrations.

Front

Protection from ultraviolet radiation.

Back

The stratospheric ozone layer protects living things from the sun's ultraviolet radiation.

Front

Interplay of atmosphere and life.

Back

The next lesson discusses the detailed interaction between the atmosphere and life.