5.Question 5Which one of the following statements is correct?1 pointArchea dominated the Earth and its atmosphere for the vast majority of the history of the Earth.After the rise of oxygen the archea all went extinct and we only find them in the fossil record todayNone of these statements is correctThe Archean on the Earth and the Noachian on Mars cover approximately the same time periods.During the Great Oxygenation Event photosynthetic microbes poisoned the atmosphere for much of the previous life on EarthThe banded iron formations occurred when methanogens reduced the iron ore leading to enhanced rusting.If photosynthesis had never developed on Earth we would have a climate much like that of Mars today6.Question 6

4.Question 4Which of the following statements is not true?1 pointIf microbes are to hitchhike from Earth to Mars, the rock in which they are embedded needs to not have been molten by the initial impact.If microbes hitchhiked to Mars from Earth and found a habitable environment, the terrestrial microbes would most likely have had to have been archea.Microbes would have been more likely to have survived the trip from Earth to Mars if they were in space for only a few years.Microbes capable of surviving years in space have been found.To survive unmelted, the rocks with embedded microbes would need to fall on a planet with a very small atmosphereMeteorites have been found on the Earth that have come from Mars and that have stayed at temperatures low enough for microbe survivalMicrobes could have traveled from Mars to Earth and started life on Earth

Chose the correct statement(s)(a) A very thin envelope of gases that surrounded the earth at the time of its formation.(b) About 600 billion years ago plants and animals were formed on the Earth.(c) The two probable sources of oxygen in the atmosphere are photodissociation of watermolecule and evapotranspiration.(d) The evidence of oxygen in the ocean is noted between 2.5 and 3.0 billion years ago.(a) and (b)(b) and (c)(c) and (d)(a) and (d)

Evaluate which of the following statements about the great oxygenation event are true. Cyanobacteria in the oceans produced a large amount of oxygen as the product of a chemical reactionThe proportion of carbon dioxide in the atmosphere increasedCyanobacteria in the oceans used up most of the oxygen in the atmosphere for photosynthesisBefore the event, no organisms were capable of photosynthesisTotal available marks: 5

The four sentences (labelled 1, 2, 3 and 4) below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer.1. Billions of years ago, shifts in atmospheric composition like the impact of photosynthetic life set precedents for major climatic changes.2. Sustained volcanic activity, driven by the movement of Earth's tectonic plates, can alter regional and global climates by modifying ocean currents and wind patterns.3. The Earth's climate evolves due to interactions between the atmosphere and various geological, chemical, biological, and geographical factors.4. Human beings significantly impact climate change by emitting greenhouse gases into the atmosphere; however, this is just one part of a complex equation.

How did Earth's atmosphere become oxygen-rich?A.Biological activityB.Volcanic outgassingC.Ozone depletionD.Tectonic movementSUBMITarrow_backPREVIOUS