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Science · Earth sciences
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a. oxygen (02), 21%, and carbon dioxide (CO23. 78%. b, water (H2O), 21%, and oxygen (02), 78% @ c. carbon dioxide (CO2. 21%, and oxygen (OZ. 78%. O d, nitrogen (N2), 78%, and oxygen (02) 2 1 %. 5 points Save Answer QUESTION 13 Which of Earths layers accounts for most of the volume of Earth? o a the mantle e b. the crust C, the inner core o d. the lithosphere 5 points save Answer QUESTION 14 Which of the following groups of elements make up the most mass of the whole Earth? oa.nitrogen, oxygen, helium, and carbon dioxide e b.silicon, iron, potassium, and sodium c, magnesium, iron, carbon dioxide, and argon o d.iron, oxygen, silicon, and magnesium QUESTION 15 5 points Save Answer Which of the following is caused by the interaction of the solar wind with magnetic lines of force and gases in polar regions? o a. a dipole o b. the Van Allen belts c. the heliosphere o d. the aurorae QUESTION 16 5 points Save Answer Which of the following serve as a trap for cosmic rays and shield life orn Earth from excessive radiation? a. Oort Cloud O b. Asteroid belt
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