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7.9A: Characteristics of the Solar System Earth and Space 1 2 What is the most important factor that determines Earth’s temperature? A Amount of water on the planet B Proximity to the Sun C Gas composition of the atmosphere D Distance to the Moon Earth is currently 150 million km away from the Sun. If Earth was 200 million km away from the Sun, it would no longer support life because - A the surface water would evaporate. B the temperature would be too cold. C the oxygen would leave the atmosphere. D there would be less exposure to solar wind. 1 7.9A: Characteristics of the Solar System Earth and Space 3 4 The magnetic field of Earth protects life against - A falling meteors from outer space. B high energy particles from the Sun. C ultraviolet radiation from the stars. D debris ejected from the Moon. The layer of ozone in the upper atmosphere of Earth is important to life because it shields Earth from - A impacts from meteors. B solar winds. C ultraviolet radiation. D changes in temperature. 2 7.9A: Characteristics of the Solar System Earth and Space 5 Which of the following characteristics of the planet, Earth, is essential to the survival of every living organism? A Earth has abundant available water. B Earth has just one orbiting moon. C Earth orbits the Sun once every 365 days. D Earth rotates on its axis once every 24 hours. 3
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