April 22 is 50th Earth Day. The theme of this year's Earth Day is "Preserve beautiful Earth and protect natural resources." A number of thematic events were held in many places in country to promote knowledge of earth sciences and promote concept of environmental protection. In picture, students from Fifth Experimental Primary School in Zunhua City, Hebei Province create paintings on theme "Care for Environment and Protect the Earth." Published by Xinhua News Agency (photo by Liu Mancang)
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