Earth and atmospheric science

Recall that gases emitted by intense volcanic activity formed the Earth's early atmosphere.

Describe the proposed composition of the Earth's early atmosphere, including a lack of oxygen, high levels of carbon dioxide, water vapour, and trace gases, and interpret relevant geological evidence.

Explain how the cooling of the Earth allowed the condensation of water vapour to form the first oceans.

Explain how atmospheric carbon dioxide levels decreased as it dissolved into the newly formed oceans.

Explain how the emergence and growth of primitive plants reduced atmospheric carbon dioxide and progressively increased oxygen levels through the process of photosynthesis.

Describe the standard chemical test used to identify oxygen gas.

Describe the greenhouse effect as the process where atmospheric gases like carbon dioxide, methane, and water vapour absorb and re-radiate heat from the Earth, thereby warming the planet.

Evaluate the scientific evidence suggesting human activity is responsible for modern climate change, analyzing correlations between fossil fuel consumption and temperature changes while considering measurement uncertainties and historical accuracy.

Describe the gas composition of the Earth's current atmosphere.

Describe the potential climatic impacts of elevated carbon dioxide and methane levels driven by human activities such as fossil fuel combustion and livestock farming.

Evaluate potential mitigation strategies for climate change, considering their scale, associated risks, and broader environmental implications.