Which of the following has NOT been a natural cause of variation in Earth's climate over the past 800,000 years?Responsesvariance in the obliquity of Earth's orbit around the sunvariance in the obliquity of Earth's orbit around the sunvariance in glacial ice formationvariance in glacial ice formationvariance in the eccentricity of Earth's orbit around the sunvariance in the eccentricity of Earth's orbit around the sunvariance in the concentration of chlorofluorocarbons in the Earth's atmospherevariance in the concentration of chlorofluorocarbons in the Earth's atmosphere

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.

What region of the Earth experiences the least seasonal variation?

A particularly interesting hypothesis for intermediate-term climatic events was putforward by the Serbian astronomer Milutin Milankovitch during the 1920s. He proposed that minorirregularities in Earth's rotation and orbit are sufficient to alter the amount of solar radiation theEarth receives at any given latitude, and hence can affect climatic changes. Now called theMilankovitch theory, the hypothesis was initially ignored but has received renewed interest duringthe past 20 years.4. According to paragraph 4, the Milankovitch theory proposes which of the following?A: Climatic change occurs when irregularities in Earth's orbit and rotation take place at the sametime that the amount of solar radiation reaching the Earth decreases.B: The amount of solar radiation reaching Earth at any given latitude varies throughout the year,causing climatic change.C: Slight variations in Earth's orbit and rotation can affect the climate by changing the amount ofsolar radiation received by Earth at any given latitude.D: Climatic change occurs when changes in the amount of solar radiation received by Earth aregreat enough to alter Earth's orbit and rotation

What causes Earth’s seasons?

How did the evolution of photosynthesis affect the Earth’s climate?