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Which element is essential for photosynthesis besides carbon dioxide and water?
Which type of rock is formed from cooled magma or lava?
What is the study of the stars and celestial objects called?
Which part of the human ear helps maintain balance?
Which vitamin deficiency leads to beriberi?
What is the chemical process by which iron rusts?
What is the name of the process where a solid changes directly to gas?
Which planet has the shortest day in the solar system?
Which gas is released by volcanoes in large quantities?
What is the primary function of the human liver?